bassA = \relative cis, {
  \time 2/4
  r4 r8 cis ~             |
  cis4 gis | cis gis      |
  cis gis  | cis r8 cis ~ |
  cis4 gis | cis gis      |
  cis gis  |

  dis'8 ais r d8 ~ d8 a4 d,8 |
  dis'8 ais r d8 ~ d2        |
  cis4 gis |

  cis, gis' cis gis |
  cis gis cis gis   |
  cis gis cis gis   |
  cis gis |

  dis'8 ais r d8 ~ d8 a4 d,8 |
  dis'8 ais r d8 ~ d2        |

  cis4 gis | cis4 gis |
  cis4 gis | cis4 gis |
}

bassB = \relative cis, {
  \time 2/4
  cis4 gis cis gis cis gis |
  \time 3/4
  cis8 e8 gis, gis r gis |
  \time 2/4
  a4 e a e a e   |
  a c8 b r f f r |
}

bassSpooky = \relative fis,, {
  \time 2/4
  fis8 fis  fis fis  fis fis  fis fis  fis fis  fis fis
  \time 3/4
  fis8 a8 cis, cis r cis |
  \time 2/4
  d8 d  d d  d d  d d  d d  d d
  d4 f8 e r ais, ais r
}

bassC = \relative cis, {
  \time 2/4
  b4 fis b fis b fis |
  \time 3/4
  b8 d8 fis, fis r fis |
  \time 2/4
  g4 d g d g d
  g ais8 a r dis, dis r
}

bassWeird = \relative cis, {
  \time 5/4
  g4 d g d g8 a |
  \time 9/8
  b4 fis cis'8 d cis-. r ais |
  b4 fis cis'8 d cis-. r a   |
}

bassDance = \relative cis, {
  \time 5/4 { b4 }
}

bass = {
  \set Staff.midiInstrument = #"electric bass (finger)"
  \clef "bass_8"
  \key cis \minor

  \time 4/4 \bassA
  \tempo 4 = 150
  \bassB \bassB

  \key fis \minor
  \bassSpooky \bassSpooky

  \key b \minor
  \bassC \bassC

  \repeat unfold 2 \bassWeird
  \bassDance
}