// Silent Night — Bing Crosby
// 61 bpm, 3/4, key Ab major. Source: mcgill.
// Generated by strudelify. One cycle = one bar.
setcpm(61/3)

const chords = arrange(
  // intro (4 bars)
  [4, "<Ab Eb7 Ab!2>"],
  // verse (24 bars)
  [24, "<Ab!4 Ebsus Eb Ab!2 Db!2 Ab!2 Db!2 Ab!2 Eb7!2 Ab!3 Eb Ab!2>"],
  // verse (24 bars)
  [24, "<Ab Ab^7 Abadd9 Ab^7 Eb7!2 Ab [Ab^7@2 Ab7] Db [Db^7 Db6 Db7] Abadd9 [Ab^7@2 Ab7] Db [Db^7 Db6 Db7] Abadd9 Ab Eb7!2 Ab!3 Eb7 Ab!2>"],
)
const bassline = arrange(
  [4, "<eb2!4>"],
  [24, "<ab2!4 eb2!2 ab2!2 db2!2 ab2!2 db2!2 ab2!2 eb2!2 ab2!3 eb2 ab2!2>"],
  [24, "<ab2!4 eb2!2 ab2!2 db2!2 ab2!2 db2!2 ab2!2 eb2!2 ab2!3 eb2 ab2!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]").gain(0.8)

stack(keys, bass, drums)