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        [
          146,
          2,
          45,
          109
        ],
        [
          148,
          2,
          45,
          107
        ],
        [
          150,
          4,
          45,
          109
        ],
        [
          154,
          4,
          45,
          109
        ],
        [
          158,
          4,
          45,
          109
        ],
        [
          162,
          2,
          40,
          107
        ],
        [
          164,
          2,
          47,
          96
        ],
        [
          166,
          2,
          40,
          107
        ],
        [
          168,
          2,
          47,
          96
        ],
        [
          170,
          2,
          50,
          107
        ],
        [
          172,
          2,
          45,
          102
        ],
        [
          174,
          2,
          50,
          107
        ],
        [
          176,
          2,
          45,
          102
        ],
        [
          178,
          2,
          45,
          107
        ],
        [
          180,
          2,
          45,
          107
        ],
        [
          182,
          4,
          45,
          109
        ],
        [
          186,
          2,
          40,
          107
        ],
        [
          188,
          2,
          47,
          96
        ],
        [
          190,
          2,
          40,
          107
        ],
        [
          192,
          2,
          47,
          96
        ],
        [
          194,
          2,
          45,
          109
        ],
        [
          196,
          2,
          45,
          107
        ],
        [
          198,
          4,
          45,
          109
        ],
        [
          202,
          4,
          45,
          109
        ],
        [
          206,
          4,
          45,
          109
        ],
        [
          210,
          4,
          45,
          109
        ],
        [
          214,
          4,
          45,
          109
        ],
        [
          218,
          4,
          45,
          109
        ],
        [
          222,
          4,
          45,
          109
        ],
        [
          226,
          2,
          50,
          107
        ],
        [
          228,
          2,
          45,
          102
        ],
        [
          230,
          2,
          50,
          107
        ],
        [
          232,
          2,
          45,
          102
        ],
        [
          234,
          2,
          50,
          107
        ],
        [
          236,
          2,
          45,
          102
        ],
        [
          238,
          2,
          50,
          107
        ],
        [
          240,
          2,
          45,
          102
        ],
        [
          242,
          2,
          45,
          109
        ],
        [
          244,
          2,
          45,
          107
        ],
        [
          246,
          4,
          45,
          109
        ],
        [
          250,
          4,
          45,
          109
        ],
        [
          254,
          4,
          45,
          109
        ],
        [
          258,
          2,
          40,
          107
        ],
        [
          260,
          2,
          47,
          96
        ],
        [
          262,
          2,
          40,
          107
        ],
        [
          264,
          2,
          47,
          96
        ],
        [
          266,
          2,
          50,
          107
        ],
        [
          268,
          2,
          45,
          102
        ],
        [
          270,
          2,
          50,
          107
        ],
        [
          272,
          2,
          45,
          102
        ],
        [
          274,
          2,
          45,
          106
        ],
        [
          276,
          2,
          45,
          107
        ],
        [
          278,
          4,
          45,
          109
        ],
        [
          282,
          2,
          40,
          107
        ],
        [
          284,
          2,
          47,
          96
        ],
        [
          286,
          2,
          40,
          107
        ],
        [
          288,
          2,
          47,
          96
        ]
      ],
      "chords": [
        [
          2,
          "A5"
        ],
        [
          32,
          "D5"
        ],
        [
          48,
          "A5"
        ],
        [
          64,
          "E5"
        ],
        [
          72,
          "D5"
        ],
        [
          80,
          "A5"
        ],
        [
          88,
          "E5"
        ],
        [
          96,
          "A5"
        ],
        [
          128,
          "D5"
        ],
        [
          144,
          "A5"
        ],
        [
          160,
          "E5"
        ],
        [
          168,
          "D5"
        ],
        [
          176,
          "A5"
        ],
        [
          184,
          "E5"
        ],
        [
          192,
          "A5"
        ],
        [
          224,
          "D5"
        ],
        [
          240,
          "A5"
        ],
        [
          256,
          "E5"
        ],
        [
          264,
          "D5"
        ],
        [
          272,
          "A5"
        ],
        [
          280,
          "E5"
        ]
      ],
      "bar1_time": -0.42
    },
    "bass_rhythm": {
      "notes": 110,
      "note_values": [
        [
          "8ths",
          69
        ],
        [
          "quarters",
          31
        ]
      ],
      "notes_per_bar": 5.8,
      "offbeat_pct": 65,
      "sixteenth_offbeat_pct": 0,
      "syncopated_pct": 31,
      "main_bar_rhythm": "..x.x.x.x.x.x.x.",
      "main_bar_rhythm_pct": 32,
      "distinct_bar_rhythms": 5,
      "usual_positions": "x.X.X.X.x.X.x.X.",
      "position_pct": [
        47,
        0,
        95,
        0,
        74,
        0,
        95,
        0,
        32,
        0,
        95,
        0,
        47,
        0,
        95,
        0
      ]
    },
    "blues_form": {
      "name": "12-bar blues",
      "bars": 12,
      "template": [
        0,
        0,
        0,
        0,
        5,
        5,
        0,
        0,
        7,
        5,
        0,
        0
      ],
      "bar_sec": 1.71,
      "chorus_sec": 20.6,
      "match_pct": 100,
      "choruses": [
        0.0,
        20.2,
        40.7
      ]
    },
    "song_form": null,
    "references": {
      "progressions": [],
      "mode": null,
      "groove": null,
      "melody": [],
      "form": {
        "form": "12-bar blues",
        "examples": [
          "“Sweet Home Chicago” — Robert Johnson",
          "“Pride and Joy” — Stevie Ray Vaughan",
          "“Johnny B. Goode” — Chuck Berry",
          "“Hound Dog” — Big Mama Thornton / Elvis Presley",
          "“Billie's Bounce” — Charlie Parker"
        ]
      }
    },
    "gaps": {
      "degrees": [
        {
          "degree": "1",
          "semitones": 0,
          "note": "A",
          "strength": 1.0,
          "harmony": 0.559,
          "melody": null,
          "colour": false
        },
        {
          "degree": "2",
          "semitones": 2,
          "note": "B",
          "strength": 0.28,
          "harmony": 0.0,
          "melody": null,
          "colour": false
        },
        {
          "degree": "3",
          "semitones": 4,
          "note": "C#",
          "strength": 0.2,
          "harmony": 0.0,
          "melody": null,
          "colour": true
        },
        {
          "degree": "4",
          "semitones": 5,
          "note": "D",
          "strength": 0.4,
          "harmony": 0.242,
          "melody": null,
          "colour": false
        },
        {
          "degree": "5",
          "semitones": 7,
          "note": "E",
          "strength": 0.86,
          "harmony": 0.199,
          "melody": null,
          "colour": false
        },
        {
          "degree": "6",
          "semitones": 9,
          "note": "F#",
          "strength": 0.14,
          "harmony": 0.0,
          "melody": null,
          "colour": false
        },
        {
          "degree": "7",
          "semitones": 11,
          "note": "G#",
          "strength": 0.22,
          "harmony": 0.0,
          "melody": null,
          "colour": false
        }
      ],
      "melody_source": null,
      "gaps": [
        {
          "id": "blue_notes",
          "area": "melody",
          "title": "Blue notes",
          "have": "a 12-bar blues on A",
          "missing": "the blue notes C and G are barely heard (0.11, 0.17 against a typical 0.28)",
          "evidence": {
            "blue": {
              "C": 0.11,
              "G": 0.17
            },
            "typical": 0.28
          },
          "idea": "Bend into C (a quarter tone to a semitone) over the home chord, and answer each phrase with a lick that lands on A."
        },
        {
          "id": "tension_notes",
          "area": "melody",
          "title": "Tension notes",
          "have": "a top line that's 98% chord tones",
          "missing": "notes outside the chord (suspensions, 9ths, passing notes) that pull and resolve",
          "evidence": {
            "chord_tone_pct": 98
          },
          "idea": "Delay a chord tone: hold the note from the previous chord over the change (a suspension) and let it fall by step."
        },
        {
          "id": "mood",
          "area": "arrangement",
          "title": "Mood contrast",
          "have": "every section feels warm, upbeat (calm corner)",
          "missing": "a section in another mood: excited or tense",
          "evidence": {
            "visited": [
              "calm"
            ],
            "levers": {
              "mode": "Ionian (major)",
              "minor_chords_pct": 0,
              "brightness_hz": 491,
              "tempo_bpm": 70.0,
              "notes_per_sec": 2.3,
              "energy": 4,
              "valence": 62
            }
          },
          "idea": "For an excited section: more energy and a brighter mood: denser rhythm, a faster feel, more high end, major chords in place of minor ones."
        }
      ]
    },
    "ideas": [
      {
        "area": "melody",
        "idea": "Bend into C (a quarter tone to a semitone) over the home chord, and answer each phrase with a lick that lands on A.",
        "gap": "blue_notes"
      },
      {
        "area": "melody",
        "idea": "Delay a chord tone: hold the note from the previous chord over the change (a suspension) and let it fall by step.",
        "gap": "tension_notes"
      },
      {
        "area": "arrangement",
        "idea": "For an excited section: more energy and a brighter mood: denser rhythm, a faster feel, more high end, major chords in place of minor ones.",
        "gap": "mood"
      },
      {
        "area": "melody/harmony",
        "idea": "It's a blues, so the melody lives on the blues scale — A C D Eb E G (minor pentatonic plus the b5) — over major, dominant-7th chords. On the A chord, bend the minor 3rd (C) up towards the major 3rd (C#); end phrases on A or the b7 (G). Over the D chord, G and C sound bluesiest."
      },
      {
        "area": "harmony",
        "idea": "Borrow from A minor: try a minor iv — Dm, or a bVI — F."
      },
      {
        "area": "harmony",
        "idea": "The track never visits the ii chord (Bm), even though it fits the scale. That makes it a fresh place to go for a bridge or a new section."
      },
      {
        "area": "structure",
        "idea": "Smooth key-change targets (or the next song in a set): F# minor (relative), E major and D major (Camelot neighbours). For a dramatic final-chorus lift, jump up a whole step to B major."
      },
      {
        "area": "remix",
        "idea": "Same chords, new feel: try a double-time feel at ~140 BPM for an energetic remix."
      },
      {
        "area": "arrangement",
        "idea": "The quietest stretch is around 0:17. That's a natural spot for a solo instrument, a field recording, or a new melodic idea."
      },
      {
        "area": "rhythm",
        "idea": "The groove sits mostly on the beat. Try anticipating chord changes by an 8th note, or add muted percussive 'chops' on the off-beats to make it swing."
      },
      {
        "area": "sound",
        "idea": "There's almost nothing below 60 Hz or above 6 kHz, which is normal for a phone recording, so judge the mix from a proper one. When you produce it, those empty ranges are room to fill: a sub-bass under the roots, and something airy on top (shimmer, hi-hats, a high counter-melody)."
      },
      {
        "area": "blues",
        "idea": "Blues is built on 12-bar choruses and call-and-response: leave space after each phrase for an answering lick, and try a turnaround (I–IV–I–V) in the last two bars."
      }
    ],
    "guitar": null,
    "blues_variations": [
      {
        "name": "quick-change blues with dominant 7ths",
        "why": "The classic blues sound: every chord a dominant 7th, the IV chord in bar 2, and V in bar 12 to turn around.",
        "chords": [
          "A7",
          "D7",
          "A7",
          "A7",
          "D7",
          "D7",
          "A7",
          "A7",
          "E7",
          "D7",
          "A7",
          "E7"
        ]
      },
      {
        "name": "jazz blues",
        "why": "Bebop-style: a ii–V into the IV chord (bar 4), a passing diminished chord (bar 6), and a VI7–ii–V back home.",
        "chords": [
          "A7",
          "D7",
          "A7",
          "Em7",
          "D7",
          "D#dim7",
          "A7",
          "F#7",
          "Bm7",
          "E7",
          "A7",
          "E7"
        ]
      }
    ],
    "producer": null,
    "analyzer_version": "438e2586",
    "midi": [
      {
        "file": "Solo_guitar_blues_generated__low_part_transcription.mid",
        "label": "lowest part, note by note (114 notes at their real times)",
        "chords": []
      },
      {
        "file": "Solo_guitar_blues_generated__low_part_from_sheet.mid",
        "label": "lowest part, from the sheet music (on the beat grid, 19 bars, bar 1 = 0:00 in the recording)",
        "chords": []
      },
      {
        "file": "Solo_guitar_blues_generated__detected_loop_1.mid",
        "label": "detected loop 1",
        "chords": [
          "A5",
          "D5",
          "A5",
          "E5",
          "D5",
          "A5",
          "E5"
        ]
      },
      {
        "file": "Solo_guitar_blues_generated__loop_1_variation_relative_sub.mid",
        "label": "loop 1 variation relative sub",
        "chords": [
          "F#m",
          "D5",
          "A5",
          "E5",
          "D5",
          "A5",
          "E5"
        ]
      },
      {
        "file": "Solo_guitar_blues_generated__blues_quick_change_blues_with_dominant_7ths.mid",
        "label": "blues quick-change blues with dominant 7ths",
        "chords": [
          "A7",
          "D7",
          "A7",
          "A7",
          "D7",
          "D7",
          "A7",
          "A7",
          "E7",
          "D7",
          "A7",
          "E7"
        ]
      },
      {
        "file": "Solo_guitar_blues_generated__blues_jazz_blues.mid",
        "label": "blues jazz blues",
        "chords": [
          "A7",
          "D7",
          "A7",
          "Em7",
          "D7",
          "D#dim7",
          "A7",
          "F#7",
          "Bm7",
          "E7",
          "A7",
          "E7"
        ]
      }
    ],
    "sheets": [
      {
        "file": "Solo_guitar_blues_generated__low_part.musicxml",
        "label": "lowest part sheet music (MusicXML: open in MuseScore, Sibelius, Dorico or a DAW to edit and play)"
      },
      {
        "file": "Solo_guitar_blues_generated__low_part.html",
        "label": "lowest part sheet music, engraved (1 page(s); open in a browser, print to PDF)"
      }
    ]
  }
]