// Old Days — Chicago
// 124 bpm, 4/4, key C major. Source: mcgill.
// Generated by strudelify. One cycle = one bar.
setcpm(124/4)

const chords = arrange(
  // intro (8 bars)
  [8, "<[Em@2 Dm@2] [F@2 Em@2] G!2 [Em@2 Dm@2] [F@2 Em@2] G!2>"],
  // verse (24 bars)
  [24, "<[C@2 Em7@2] F69 [C@2 Dm7@2] [F@2 G7@2] [C@2 Em7@2] F69 [C@2 Dm7@2] [F@2 G7@2] Dm7 G7 Dm7 G7 Dm7 G7 Dm7 [E7sus@2 E7@2] Am E7 G6 D7 Am E7 G6 D7>"],
  // interlude (13 bars)
  [13, "<F!2 Am7!2 F!2 Am7!2 Dm7 Em7 F G7sus G6>"],
  // intro (8 bars)
  [8, "<[Em@2 Dm@2] [F@2 Em@2] G!2 [Em@2 Dm@2] [F@2 Em@2] G!2>"],
  // verse (24 bars)
  [24, "<[C@2 Em7@2] F69 [C@2 Dm7@2] [F@2 G7@2] [C@2 Em7@2] F69 [C@2 Dm7@2] [F@2 G7@2] Dm7 G7 Dm7 G7 Dm7 G7 Dm7 [E7sus@2 E7@2] Am E7 G6 D7 Am E7 G6 D7>"],
  // chorus (20 bars)
  [20, "<[F@2 Em@2] G [F@2 Em@2] G [F@2 Em@2] G [F@2 Em@2] G [F@2 Em@2] G [F@2 Em@2] G [F@2 Em@2] G [F@2 Em@2] G [F@2 Em@2] G [F@2 Em@2] G>"],
  // fadeout (12 bars)
  [12, "<[F@2 Em@2] G [F@2 Em@2] G [F@2 Em@2] G [F@2 Em@2] G [F@2 Em@2] G [F@2 Em@2] G>"],
)
const bassline = arrange(
  [8, "<[e2@2 d2@2] [f2@2 e2@2] g2 a2 [e2@2 d2@2] [f2@2 e2@2] g2!2>"],
  [24, "<[c2@2 e2@2] f2 [c2@2 d2@2] [f2@2 g2@2] [c2@2 e2@2] f2 [c2@2 d2@2] [f2@2 g2@2] d2 g2 d2 g2 d2 g2 d2 e2 a2 g#2 g2 f#2 a2 g#2 g2 f#2>"],
  [13, "<f2!2 a2!2 f2!2 a2!2 d2 e2 f2 g2!2>"],
  [8, "<[e2@2 d2@2] [f2@2 e2@2] g2 a2 [e2@2 d2@2] [f2@2 e2@2] g2!2>"],
  [24, "<[c2@2 e2@2] f2 [c2@2 d2@2] [f2@2 g2@2] [c2@2 e2@2] f2 [c2@2 d2@2] [f2@2 g2@2] d2 g2 d2 g2 d2 g2 d2 e2 a2 g#2 g2 f#2 a2 g#2 g2 f#2>"],
  [20, "<[f2@2 e2@2] g2 [f2@2 e2@2] g2 [f2@2 e2@2] g2 [f2@2 e2@2] g2 [f2@2 e2@2] g2 [f2@2 e2@2] g2 [f2@2 e2@2] g2 [f2@2 e2@2] g2 [f2@2 e2@2] g2 [f2@2 e2@2] g2>"],
  [12, "<[f2@2 e2@2] g2 [f2@2 e2@2] g2 [f2@2 e2@2] g2 [f2@2 e2@2] g2 [f2@2 e2@2] g2 [f2@2 e2@2] g2>"],
)

// chords · gm_piano
const keys = chord(chords).voicing().s("gm_piano").gain(0.8)
// bass · gm_electric_bass_finger
const bass = note(bassline).s("gm_electric_bass_finger").gain(0.9)
// drums
const drums = s("[bd hh] [sd hh] [bd hh] [sd hh]").gain(0.8)

stack(keys, bass, drums)