\version "2.19.27"

\header {
  title = "Song 1"
  composer = "The very pretentious elephlies"
  arranger = "Ricardo Wurmus"
  copyright = "2002--2016 Ricardo Wurmus"
}

nastyPause = {
  \time 6/8
  \repeat unfold 8 { r4. r4.|}
}

\include "parts/bass.ly"
\include "parts/keys.ly"
\include "parts/stick.ly"
\include "parts/click.ly"

AllMusic = <<
  \new Staff = "keyboard"    { \keyboard }
  \new Staff = "bass"        { \bass }
  \new Staff = "grand stick" { \stick }
>>

%% Two scores are needed: one with unfolded repeats for MIDI and the
%% other with regular repeats for notation.
\score {
  \unfoldRepeats {
    <<
      \AllMusic
      \new DrumStaff { \click }
    >>
  }
  \midi { \tempo 4 = 180 }
}

\score {
  \AllMusic
  \layout {
    \tempo 4 = 180
    \context {
      %% add the RemoveEmptyStaffContext that erases rest-only staves
      \Staff \RemoveEmptyStaves
    }
    \context {
      \Score
      \numericTimeSignature
      %% Remove all-rest staves also in the first system
      \override VerticalAxisGroup.remove-first = ##t
      %% If only one non-empty staff in a system exists, still print the starting bar
      \override SystemStartBar.collapse-height = #1
    }
  }
}