// Sidewalk Surfin' — Jan & Dean
// 136 bpm, 4/4, key D major. Source: mcgill.
// Generated by strudelify. One cycle = one bar.
setcpm(136/4)

const chords = arrange(
  // intro (4 bars)
  [4, "<~!2 D!2>"],
  // verse (16 bars)
  [16, "<D!4 A!2 D!2 G!2 D!2 [A@2 F@2] [G@2 A@2] D A>"],
  // verse (16 bars)
  [16, "<D!4 A!2 D!2 G!2 D!2 [A@2 F@2] [G@2 A@2] D Eb7>"],
  // solo (8 bars)
  [8, "<Eb!4 Bb!2 Eb!2>"],
  // verse (8 bars)
  [8, "<Ab!2 Eb!2 [Bb@2 Gb@2] [Ab@2 Bb@2] Eb!2>"],
  // verse (16 bars)
  [16, "<Eb!4 Bb!2 Eb Eb7 Ab!2 Eb!2 [Bb@2 Gb@2] [Ab@2 Bb@2] Eb!2>"],
  // outro (12 bars)
  [12, "<[Bb@2 Gb@2] [Ab@2 Bb@2] Eb!2 [Bb@2 Gb@2] [Ab@2 Bb@2] Eb!2 [Bb@2 Gb@2] [Ab@2 Bb@2] Eb!2>"],
  // fadeout (8 bars)
  [8, "<[Bb@2 Gb@2] [Ab@2 Bb@2] Eb!2 [Bb@2 Gb@2] [Ab@2 Bb@2] Eb!2>"],
)
const bassline = arrange(
  [4, "<~!2 d2!2>"],
  [16, "<d2!4 a2!2 d2!2 g2!2 d2!2 [a2@2 f2@2] [g2@2 a2@2] d2 a2>"],
  [16, "<d2!4 a2!2 d2!2 g2!2 d2!2 [a2@2 f2@2] [g2@2 a2@2] d2 eb2>"],
  [8, "<eb2!4 bb2!2 eb2!2>"],
  [8, "<ab2!2 eb2!2 [bb2@2 gb2@2] [ab2@2 bb2@2] eb2!2>"],
  [16, "<eb2!4 bb2!2 eb2!2 ab2!2 eb2!2 [bb2@2 gb2@2] [ab2@2 bb2@2] eb2!2>"],
  [12, "<[bb2@2 gb2@2] [ab2@2 bb2@2] eb2!2 [bb2@2 gb2@2] [ab2@2 bb2@2] eb2!2 [bb2@2 gb2@2] [ab2@2 bb2@2] eb2!2>"],
  [8, "<[bb2@2 gb2@2] [ab2@2 bb2@2] eb2!2 [bb2@2 gb2@2] [ab2@2 bb2@2] eb2!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)