// Some Days Are Diamonds (Some Days Are Stone) — John Denver
// 104 bpm, 4/4, key G major. Source: mcgill.
// Generated by strudelify. One cycle = one bar.
setcpm(104/4)

const chords = arrange(
  // intro (4 bars)
  [4, "<G Gsus G Gsus>"],
  // verse (16 bars)
  [16, "<G D7 Em [Em@3 D] C!2 G!2 C!2 G!2 Em A7 D7!2>"],
  // chorus (18 bars)
  [18, "<G Cadd9 G!2 Em A7 D7!2 G C G [Em@2 C@2] G D7 G [C@2 C#o@2] D D7>"],
  // interlude (4 bars)
  [4, "<G Gsus G Gsus>"],
  // verse (16 bars)
  [16, "<G D7 Em [Em@3 D] C!2 G!2 C!2 G!2 Em A7 D7!2>"],
  // chorus (16 bars)
  [16, "<G Cadd9 G!2 Em A7 D7!2 G C G [Em@2 C@2] G D7 G D7sus>"],
  // interlude (2 bars)
  [2, "<A D7sus>"],
  // chorus (16 bars)
  [16, "<A Dadd9 A!2 F#m B7 E7!2 A D A [F#m@2 D@2] A E7 A E7sus>"],
  // fadeout (8 bars)
  [8, "<A Dadd9 A!2 F#m B7 E7!2>"],
)
const bassline = arrange(
  [4, "<g2!4>"],
  [16, "<g2 f#2 e2 [e2@3 d2] c2!2 g2!2 c2!2 g2!2 e2 a2 d2!2>"],
  [18, "<g2 c2 g2!2 e2 a2 d2!2 g2 c2 g2 [e2@2 c2@2] g2 d2 [g2@2 b2@2] [c2@2 c#2@2] d2!2>"],
  [4, "<g2!4>"],
  [16, "<g2 f#2 e2 [e2@3 d2] c2!2 g2!2 c2!2 g2!2 e2 a2 d2!2>"],
  [16, "<g2 c2 g2!2 e2 a2 d2!2 g2 c2 g2 [e2@2 c2@2] g2 d2 g2 d2>"],
  [2, "<a2 d2>"],
  [16, "<a2 d2 a2!2 f#2 b2 e2!2 a2 d2 a2 [f#2@2 d2@2] a2 e2 a2 e2>"],
  [8, "<a2 d2 a2!2 f#2 b2 e2!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)