// I Want You Back — The Jacksons
// 98 bpm, 4/4, key Ab major. Source: mcgill.
// Generated by strudelify. One cycle = one bar.
setcpm(98/4)

const chords = arrange(
  // intro (8 bars)
  [8, "<Ab Db [Fm7 Ab Db Ab] [Bbm7 Eb7 Ab@2] Ab Db [Fm7 Ab Db Ab] [Bbm7 Eb7 Ab@2]>"],
  // instrumental (4 bars)
  [4, "<[Ab Eb Fm7 Eb6] [Db@2 Bbm7 Eb7] [Fm7 Ab Db Ab] [Bbm7 Eb7 Ab@2]>"],
  // verse (8 bars)
  [8, "<Ab Db [Fm7 Ab Db Ab] [Bbm7 Eb7 Ab@2] Ab Db [Fm7 Ab Db Ab] [Bbm7 Eb7 Ab@2]>"],
  // chorus (8 bars)
  [8, "<[Ab Eb Fm7 Eb6] [Db@2 Bbm7 Eb7] [Fm7 Ab Db Ab] [Bbm7 Eb7 Ab@2] [Ab Eb Fm7 Eb6] [Db@2 Bbm7 Eb7] [Fm7 Ab Db Ab] [Bbm7 Eb7 ~@2]>"],
  // trans (4 bars)
  [4, "<[Ab@2 Db@2]!4>"],
  // verse (8 bars)
  [8, "<Ab Db [Fm7 Ab Db Ab] [Bbm7 Eb7 Ab@2] Ab Db [Fm7 Ab Db Ab] [Bbm7 Eb7 Ab@2]>"],
  // chorus (7 bars)
  [7, "<[Ab Eb Fm7 Eb6] [Db@2 Bbm7 Eb7] [Fm7 Ab Db Ab] [Bbm7 Eb7 Ab@2] [Ab Eb Fm7 Eb6] [Db@2 Bbm7 Eb7] [Fm7 Ab Db Ab]>"],
  // bridge (8 bars)
  [8, "<[Fm7 Cm Db6 Ab]!8>"],
  // instrumental (4 bars)
  [4, "<[Ab Eb Fm7 Eb6] [Db@2 Bbm7 Eb7] [Fm7 Ab Db Ab] [Bbm7 Eb7 ~@2]>"],
  // trans (2 bars)
  [2, "<[Ab@2 Db@2]!2>"],
  // chorus (4 bars)
  [4, "<[Ab Eb Fm7 Eb6] [Db@2 Bbm7 Eb7] [Fm7 Ab Db Ab] [Bbm7 Eb7 ~@2]>"],
  // trans (2 bars)
  [2, "<[Ab@2 Db@2]!2>"],
  // fadeout (4 bars)
  [4, "<[Ab Eb Fm7 Eb6] [Db@2 Bbm7 Eb7] [Fm7 Ab Db Ab] [Bbm7 Eb7 ~@2]>"],
  // trans (2 bars)
  [2, "<[Ab@2 Db@2]!2>"],
  // chorus (2 bars)
  [2, "<[Ab Eb Fm7 Eb6] [Db@2 Bbm7 Eb7]>"],
)
const bassline = arrange(
  [8, "<ab2 db2 [f2 c2 db2 ab2] [bb2 eb2 ab2@2] ab2 db2 [f2 c2 db2 ab2] [bb2 eb2 ab2@2]>"],
  [4, "<[ab2 g2 f2 eb2] [db2 c2 bb2 eb2] [f2 c2 db2 ab2] [bb2 eb2 ab2@2]>"],
  [8, "<ab2 db2 [f2 c2 db2 ab2] [bb2 eb2 ab2@2] ab2 db2 [f2 c2 db2 ab2] [bb2 eb2 ab2@2]>"],
  [8, "<[ab2 g2 f2 eb2] [db2 c2 bb2 eb2] [f2 c2 db2 ab2] [bb2 eb2 ab2@2] [ab2 g2 f2 eb2] [db2 c2 bb2 eb2] [f2 c2 db2 ab2] [bb2 eb2 ~@2]>"],
  [4, "<ab2!4>"],
  [8, "<ab2 db2 [f2 c2 db2 ab2] [bb2 eb2 ab2@2] ab2 db2 [f2 c2 db2 ab2] [bb2 eb2 ab2@2]>"],
  [7, "<[ab2 g2 f2 eb2] [db2 c2 bb2 eb2] [f2 c2 db2 ab2] [bb2 eb2 ab2@2] [ab2 g2 f2 eb2] [db2 c2 bb2 eb2] [f2 c2 db2 ab2]>"],
  [8, "<[f2 c2 db2 ab2]!8>"],
  [4, "<[ab2 g2 f2 eb2] [db2 c2 bb2 eb2] [f2 c2 db2 ab2] [bb2 eb2 ~@2]>"],
  [2, "<ab2!2>"],
  [4, "<[ab2 g2 f2 eb2] [db2 c2 bb2 eb2] [f2 c2 db2 ab2] [bb2 eb2 ~@2]>"],
  [2, "<ab2!2>"],
  [4, "<[ab2 g2 f2 eb2] [db2 c2 bb2 eb2] [f2 c2 db2 ab2] [bb2 eb2 ~@2]>"],
  [2, "<ab2!2>"],
  [2, "<[ab2 g2 f2 eb2] [db2 c2 bb2 eb2]>"],
)

// 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)