// D'yer Mak'er — Led Zeppelin
// 83 bpm, 4/4, key C major. Source: mcgill.
// Generated by strudelify. One cycle = one bar.
setcpm(83/4)

const chords = arrange(
  // intro (6 bars)
  [6, "<~!2 [C@2 Am@2] [F@2 G@2] [C@2 Am@2] [F@2 G@2]>"],
  // chorus (16 bars)
  [16, "<[C@2 Am@2] [F@2 G@2] [C@2 Am@2] [F@2 G@2] [C@2 Am@2] [F@2 G@2] Am!2 [C@2 Am@2] [F@2 G@2] [C@2 Am@2] [F@2 G@2] [C@2 Am@2] [F@2 G@2] Am!2>"],
  // verse (8 bars)
  [8, "<Am G Am G Am G F G>"],
  // chorus (16 bars)
  [16, "<[C@2 Am@2] [F@2 G@2] [C@2 Am@2] [F@2 G@2] [C@2 Am@2] [F@2 G@2] Am!2 [C@2 Am@2] [F@2 G@2] [C@2 Am@2] [F@2 G@2] [C@2 Am@2] [F@2 G@2] Am!2>"],
  // verse (8 bars)
  [8, "<Am G Am G Am G F G>"],
  // chorus (16 bars)
  [16, "<[C@2 Am@2] [F@2 G@2] [C@2 Am@2] [F@2 G@2] [C@2 Am@2] [F@2 G@2] Am!2 [C@2 Am@2] [F@2 G@2] [C@2 Am@2] [F@2 G@2] [C@2 Am@2] [F@2 G@2] Am!2>"],
  // outro (16 bars)
  [16, "<[C@2 Am@2] [F@2 G@2] [C@2 Am@2] [F@2 G@2] [C@2 Am@2] [F@2 G@2] [C@2 Am@2] [F@2 G@2] [C@2 Am@2] [F@2 G@2] [C@2 Am@2] [F@2 G@2] [C@2 Am@2] [F@2 G@2] [C@2 Am@2] [F@2 G@2]>"],
  // fadeout (4 bars)
  [4, "<[C@2 Am@2] [F@2 G@2] [C@2 Am@2] [F@2 G@2]>"],
)
const bassline = arrange(
  [6, "<~!2 [c2@2 a2@2] [f2@2 g2@2] [c2@2 a2@2] [f2@2 g2@2]>"],
  [16, "<[c2@2 a2@2] [f2@2 g2@2] [c2@2 a2@2] [f2@2 g2@2] [c2@2 a2@2] [f2@2 g2@2] a2!2 [c2@2 a2@2] [f2@2 g2@2] [c2@2 a2@2] [f2@2 g2@2] [c2@2 a2@2] [f2@2 g2@2] a2!2>"],
  [8, "<a2 g2 a2 g2 a2 g2 f2 g2>"],
  [16, "<[c2@2 a2@2] [f2@2 g2@2] [c2@2 a2@2] [f2@2 g2@2] [c2@2 a2@2] [f2@2 g2@2] a2!2 [c2@2 a2@2] [f2@2 g2@2] [c2@2 a2@2] [f2@2 g2@2] [c2@2 a2@2] [f2@2 g2@2] a2!2>"],
  [8, "<a2 g2 a2 g2 a2 g2 f2 g2>"],
  [16, "<[c2@2 a2@2] [f2@2 g2@2] [c2@2 a2@2] [f2@2 g2@2] [c2@2 a2@2] [f2@2 g2@2] a2!2 [c2@2 a2@2] [f2@2 g2@2] [c2@2 a2@2] [f2@2 g2@2] [c2@2 a2@2] [f2@2 g2@2] a2!2>"],
  [16, "<[c2@2 a2@2] [f2@2 g2@2] [c2@2 a2@2] [f2@2 g2@2] [c2@2 a2@2] [f2@2 g2@2] [c2@2 a2@2] [f2@2 g2@2] [c2@2 a2@2] [f2@2 g2@2] [c2@2 a2@2] [f2@2 g2@2] [c2@2 a2@2] [f2@2 g2@2] [c2@2 a2@2] [f2@2 g2@2]>"],
  [4, "<[c2@2 a2@2] [f2@2 g2@2] [c2@2 a2@2] [f2@2 g2@2]>"],
)

// 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)