// I Need You Tonight — Backstreet Boys
// 41 bpm, 2/4, key C major. Source: midi.
// Generated by strudelify. One cycle = one bar.
// note: Full arrangement: all 39 bars on a 16-step grid, each part at one level. Source detail keeps the original performance.
setcpm(41/2)

// 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 · "PianoGrd"
const piano = note("<A@8 B@7 C@7 D E@8 F@8>".pickRestart({
  A: "[~@19 c4@4 ~@24 c5@2 ~@34 c4@4 ~@8 g4@4 ~@8 [f2,f3,a3]@6 g3@3 ~@4 c4@2 f3@2 ~@2 a3@2, ~@7 f5@4 c2@8 ~@8 g2@8 ~@6 e5@4 e3@4 b3@8 [f4,a4]@6 f3@4 a3@8 c2@8 ~@8 [g2,d3,b3,d4]@8 [a2,e3,c4,e4]@8 ~@15 [f2,a3,c4]@6, ~@9 e5@6 c3@4 ~@4 g4@6 d3@4 a3@4 ~@2 f5@4 ~@4 a3@4 c4@8 f2@8 ~@6 e4@4 g2@4 d3@4 ~@2 g3@8 ~@8 g3@8 ~@7 a3@4 ~@6, ~@13 g2@4 g3@8 d5@6 g3@4 b3@8 a2@6 c5@4 ~@2 g4@4 ~@2 c3@4 g3@4 ~@2 f4@4 ~@4 c3@4 e3@8 ~@25 f3@4 ~@4 f3@4]/8", // F G Am F
  B: "[~ b3 ~@20 c5 ~@32 a3, c4@2 b3@2 f3@2 g2@2 g3@2 d5@2 [b4,d5]@3 g3@2 b3@4 a2@4 ~@4 [f2,f4,a4]@4 ~@4 [c2,c4,e4]@4 ~@4 g2@4 ~@4 a2@3, ~ [g2,d4]@4 [c2,e3]@4 e5@2 c5@2 ~ d3@2 a3@2 ~ e5@2 ~@2 [a4,c5]@4 b4@2 ~@2 [f3,g4]@2 f4@2 f4@2 ~@2 c3@2 e5@2 c5@2 ~@2 [g3,c5]@2 b3@4 ~ e3@2, ~ g3@2 g3@2 c3@2 c3@2 c4@4 g2@4 ~@3 d5@2 e3@2 b3@2 ~@2 c5@2 ~@2 c4@4 d4@2 g2@2 g3@2 d5@2 d5@4 ~@3 c5 c5@4, ~@46 a3@4 c4@8 ~@2 c3@4 ~@4 g4@4 ~@10 c4@8 ~@2 d3@4 [a3,d5]@4 ~@3 a4@4 ~@5]/7", // Bm F C G5 C Am Fsus2 C5 …
  C: "[~@17 e5@2 ~@14 a3@3 ~@12 e5@2 ~@5 [b3,d5], b3@2 ~ b4@2 [f2,f4,a4]@4 ~ g4@2 ~@3 e3@2 g3@4 a2@3 b3@2 ~ g4@2 ~ g4@4 ~@2 [a4,c5]@2 ~@2 b4@2 d5@2 ~@2 e3@2 g3@4 ~ e3@2 ~, ~ c4@3 c5@2 c3@2 c4@4 d4@2 b2@2 f3@4 c5@2 e3@2 d5@4 [f4,a4]@3 f3@2 ~@3 f2@4 ~@4 [e2,c5,e5]@4 ~@4 a2@4, ~@7 [f3,g4]@2 f4@2 f4@2 [e2,c4,e4]@3 f5@2 ~ d5@2 ~@2 [a3,e5]@2 c4@4 f2@3 g3@2 ~@3 c3@2 [g3,a4]@2 c5@2 f5@2 ~@5 d5@2 ~@4, ~@30 c3@2 c4@4 ~@2 [f3,b4]@2 a3@4 ~ b2@2 [f3,f5]@2 ~@2 c5@2 ~ [a3,e5]@2]/7", // Bm F Am F C Fsus2 C A5 …
  D: "~@13 [f3,c5]@2 g3, c4@7 f5@4 [c3,e5]@4 ~, ~@5 e5@4 f2@7, ~@3 d5", // F5 C
  E: "[~@81 a3@4 ~@8 c5@2 ~@30 [a3,e5]@2 [b3,f5], ~ a3@6 [b4,d5]@16 e5@16 [b4,d5]@16 [c5,e5]@6 a3@4 c4@8 f2@8 ~@8 c2@6 g3@4 ~@2 g4@4 ~@2 d3@4 a3@4 ~ f5@3 f5@4 ~@5, ~@5 g4@4 g2@8 ~@6 c5@8 g3@4 ~@2 g4@4 ~@4 g3@8 f5@4 ~@4 c5@16 f3@4 ~@6 c5@6 c3@4 c4@8 g2@8 ~@4 e5@4 e5@4 ~@3, ~@11 d3@4 a3@4 ~@2 f5@4 ~@2 g2@2 c3@4 [c4,c5]@8 ~@2 d3@6 b3@8 ~@2 e3@4 b3@4 ~@2 g4@4 ~@2 c3@4 g3@4 ~@2 f5@4 ~@2 [g2,d5]@4 c5@8 [b4,d5]@16 ~@4 [e3,f5]@4 ~, ~@13 g3@4 b3@8 c2@8 ~@8 g2@6 a3@8 ~@2 a2@8 ~@6 [f4,a4]@16 e5@16 ~@6 g3@4 b3@8 a2@7]/8", // A5 Bdim Bm C G5 Bm Fmaj7 F
  F: "[~ e5@4 ~@23 a4 ~@4 d5@3 ~@3 c5@2 ~@8 e3@6 ~@10 b3@6 ~@10 a3@6 ~@16 d4@3 ~@2 c4@16 ~@4, ~ c4@6 [a4,c5]@16 c5@4 ~@4 c5@4 ~ e5@4 ~@5 c3@8 ~@6 d3@2 g3@4 ~@8 f2@6 g3@4 ~@8 b2@2 e3@4 g3@8 ~ [c2,c3,g3,e4]@16 ~@6, ~@5 d5@4 f2@8 ~@8 [f2,a4]@4 [f3,a4]@4 ~@10 g2@8 ~@6 g2@6 a3@4 ~@4 [f4,a4]@32 ~@4 d4@4 ~@17, ~@11 c3@4 g3@4 ~@2 b4@4 f4@8 ~@4 d5@4 [a4,c5]@32 ~@2 c3@2 f3@4 ~@8 e2@6 f3@4 ~@2 f4@4 ~@23, ~@13 f3@4 a3@8 ~@2 c3@4 ~@2 [f2,c3,f3,f5]@8 c2@6 d3@8 [g4,b4]@32 [e4,g4]@16 ~@3 c4@2 ~@20]/8", // Am C F Am F5 G Em
})).s("gm_piano").gain(0.51)

stack(piano)