// Preludes Op.28 — Frédéric François Chopin
// 48 bpm, 4/4, key A major. Source: midi.
// Generated by strudelify. One cycle = one bar.
// note: Tempo changes preserved in elapsed time; displayed bars use the dominant tempo.
// note: metre changes (1/4 at bar 1, 4/4 at bar 2) are rendered on a constant 4/4 grid of one bar per cycle
// note: sustain pedal (CC 64) lengthens the held notes
// note: Transcription provider: pdmx. https://musescore.com/score/2504991; license: https://creativecommons.org/publicdomain/mark/1.0/
// note: Full arrangement: all 28 bars on a 48-step grid, each part at one level. Source detail keeps the original performance.
setcpm(48/4)

// Notation: c3@3 lasts 3 steps · ~ is a rest · [c3,e3] is a chord · "a, b" plays two voices at once · [...]/2 spreads a riff over 2 bars.
// A part's distinct bars are riffs (A, B, C...) played in order: edit a riff to change every repeat.

// chords · piano
const piano = note("<A B C D E F G H I@2 J K L B M N O@8 P@4>".pickRestart({
  A: "~@12 b3@3 b4", B: "[g3,b3,e4]!8, b4@7 ~, ~@3 c5", C: "[f#3,a3,e4]!4 [f#3,a3,d#4]!4, b4, ~@3 c5",
  D: "[f3,a3,d#4]!4 [f3,a3,d4]!2 [f3,g#3,d4]!2, b4@3 c5", E: "[e3,g#3,d4]!4 [e3,g3,d4]!2 [e3,g3,c#4]!2, b4@3 a#4",
  F: "[e3,g3,c4]!4 [e3,f#3,c4]!4, a4@3 b4", G: "[e3,f#3,c4]!4 [d#3,f#3,c4]!4, a4, ~@3 b4",
  H: "[d3,f#3,c4]@2 [d3,f#3,c4]@2 [d3,f#3,c4]@2 [d3,f#3,c4]@2 [d3,f#3,c4]@2 [d3,f#3,c4]@2 [d3,f#3,c4,b4]@2 ~ a4, a4@7 [d3,f#3,c4]", // D7 Bm D7
  I: "[[d3,f3,c4]!4 [d3,f3,b3]!4 [c3,e3,b3]!2 [c3,e3,a3,a4] [c3,e3,a3,b4] [c3,e3,a3,d5] [c3,e3,a3,c5] [c3,e3,a3,e4] [c3,e3,a3,a4], a4@3 g#4@2 ~@3]/2", // Dm7 Bdim Cmaj7 Am
  J: "[b2,e3,a3]!2 [b2,d#3,a3]!2 [c3,e3,a3]!4, f#4, ~@3 a4", // Esus4 B7 Am
  K: "[b2,d#3,a3]!4 [c3,e3,a3]!2 ~ [c3,e3,a3], f#4, ~@3 b4, ~@6 [c3,e3,a3] ~, ~@37 a4@11", // B7 Am
  L: "g4@3 f#4@3 c4@3 b3@3 d#4@3 f#4@3 d5@2 c5@2 b4@2, [b2,d#3,a3] ~@3", M: "[f#3,a3,e4]!4 [f3,a3,d#4]!4, b4, ~@3 c5",
  N: "[f3,g#3,d#4]!2 [f3,g#3,d4]!2 [e3,g#3,d4]!4, b4, ~@3 c5", // Fm7 Ddim E7
  O: "[[e3,g3,d4,b4]@6 ~@3 a#4@3 b4 a#4 a#4@4 b4 ~ a4 ~ a#4 [c#3,e3,a#3]@6 [c#3,e3,a#3]@6 [c3,e3,a3,f#5]@6 ~@3 e5@3 ~@6 [a3,c4,f#4,a4]@6 [a3,c4,f#4,a4]@6 [a3,c4,f#4,a4,d#5]@6 [g3,b3,d#4,f#4,d#5]@6 [g3,b3,e4,e5]@6 [g3,b3,e4,g5]@6 [g3,b3,e4,b4]@6 [a3,c4,e4,d5]@6 [a3,c4,e4,c5]@6 ~@8 a4@4 [b2,e3,b3]@6 [b2,e3,b3]@6 [c3,e3,a3]@6 [c3,e3,a3,a4]@6 [b2,e3,b3]@6 [b2,e3,b3]@6 [b2,e3,b3]@6 [b2,e3,b3]@6 [c3,e3,a3]@6 [c3,e3,a3]@6 b4 ~@5 [c3,e3,a3]@6 [b2,e3,b3]@6 [b2,e3,b3]@6 [b2,e3,b3]@6 [b2,e3,b3]@6 [b2,d#3,b3]@6 [b2,d#3]@6 [b2,d#3,a3]@6 ~@3 e4@3 [c3,g3]@7 [c3,g3]@6 [c3,g3]@7 c3@6 [c3,a#3]@7 c3@6 [c3,e3,a3]@7 [c3,e3,a3]@6 [b2,e3,a3]@7 ~ [b2,e3,a3]@7 [b2,e3,g#3]@7 [b2,e3,g#3]@7 [b2,e3,g3]@7 [b2,e3,g3]@7 ~ [b2,e3,g3]@7 [b2,e3,g3]@7 [a#2,c3,g3,e4]@29 ~@6, ~@6 [e3,g3,d4]@6 [e3,g3,c#4]@6 [e3,g3,c#4]@5 ~@18 [c3,e3,a3]@6 [b1,b2,e5]@24 ~@36 [a2,e5]@12 ~@60 [c3,e3,a3]@6 ~@48 [b2,d#3,a3]@6 ~@33 a#3@13 ~@99, ~@14 g4 ~@4 a#4@2 ~@2 g5@12 ~@18 d#5@12 ~@46 e4@8 f#4@18 ~@6 f#4@36 ~ a4@11 f#4@48 e4@46 ~@6 e4@58 ~@35, ~@59 c6@12 ~@42 [e3,f#3,c4]@6 ~@102 b3@18 ~@20 g3@26 ~@99, ~@278 f#4@13 ~@44 f#4@14 ~@35]/8", // Em7 A#dim F#m7b5 F#dim Adim B Em Am …
  P: "[~@30 [b1,b2,e3,f#3,b3,e4]@24 [b1,f#2,b2,d#3,f#3,b3,d#4]@41 [e1,e2,e3,g3,b3,e4]@82 ~@15]/4", // Bsus4 B Em
})).s("gm_piano").gain(0.2)

stack(piano)