// Sweet Little Rock And Roll — Chuck Berry
// 151 bpm, 4/4, key G major. Source: mcgill.
// Generated by strudelify. One cycle = one bar.
setcpm(151/4)

const chords = arrange(
  // intro (1 bars)
  [1, "<G7>"],
  // verse (12 bars)
  [12, "<G7!4 D7!2 G7!2 D7 C7 G7!2>"],
  // verse (12 bars)
  [12, "<G7!4 C7!2 G7!2 D7 C7 G7!2>"],
  // chorus (12 bars)
  [12, "<G7!4 C7!2 G7!2 D7 C7 G7!2>"],
  // instrumental (12 bars)
  [12, "<G7!4 C7!2 G7!2 D7 C7 G7!2>"],
  // verse (12 bars)
  [12, "<G7 C7 G7!2 C7!2 G7!2 D7 C7 G7!2>"],
  // verse (12 bars)
  [12, "<G7!4 C7!2 G7!2 D7 C7 G7!2>"],
  // chorus (12 bars)
  [12, "<G7!4 C7!2 G7!2 D7 C7 G7!2>"],
  // fadeout (4 bars)
  [4, "<G7!4>"],
)
const bassline = arrange(
  [1, "<g2>"],
  [12, "<g2!4 a2!2 g2!2 a2 c2 g2!2>"],
  [12, "<g2!4 c2!2 g2!2 d2 c2 g2!2>"],
  [12, "<g2!4 c2!2 g2!2 d2 c2 g2!2>"],
  [12, "<g2!4 c2!2 g2!2 d2 c2 g2!2>"],
  [12, "<g2 c2 g2!2 c2!2 g2!2 d2 c2 g2!2>"],
  [12, "<g2!4 c2!2 g2!2 d2 c2 g2!2>"],
  [12, "<g2!4 c2!2 g2!2 d2 c2 g2!2>"],
  [4, "<g2!4>"],
)

// 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)