\version "2.18.2"

\header {
  title = ""
  composer = ""
  tagline = ""
}

\score {
  <<
    \new PianoStaff {
      \autochange \relative c{
        c4 d e f g a b
        c d e f g a b c
      }
    }
  >>
  \layout {
    \context {
      \Score
      timing = ##f
   }
   \context {
      \Staff
      \remove Time_signature_engraver
   }
  }
  \midi {}
}