\version "2.19.82"
\pointAndClickOff

mymusic = \relative {
  \clef treble
  <g' b e> <a c f> <b d g>4  <c e a> | <d f b> <e g c> <f a d> <g b e> |
}

\paper {
  indent = 0
}

\score {
  \new Staff { 
    \mymusic
  }
  \header { piece = "default staffsize" }
  \layout {}
}

\score {
  \new Staff { 
    \mymusic
  }
  \header { piece = "staffsize 19" }
  \layout {
        #(layout-set-staff-size 19)
  }
}

\score {
  \new Staff { 
    \mymusic
  }
  \header { piece = "staffsize 18" }
  \layout {
        #(layout-set-staff-size 18)
  }
}
\score {
  \new Staff { 
    \mymusic
  }
  \header { piece = "staffsize 17" }
  \layout {
        #(layout-set-staff-size 17)
  }
}

\score {
  \new Staff { 
    \mymusic
  }
  \header { piece = "staffsize 16" }
  \layout {
        #(layout-set-staff-size 16)
  }
}

\score {
  \new Staff { 
    \mymusic
  }
  \header { piece = "staffsize 15" }
  \layout {
        #(layout-set-staff-size 15)
  }
}

\score {
  \new Staff { 
    \mymusic
  }
  \header { piece = "staffsize 14" }
  \layout {
        #(layout-set-staff-size 14)
  }
}

\score {
  \new Staff { 
    \mymusic
  }
  \header { piece = "staffsize 13" }
  \layout {
        #(layout-set-staff-size 13)
  }
}

\score {
  \new Staff { 
    \mymusic
  }
  \header { piece = "staffsize 12" }
  \layout {
        #(layout-set-staff-size 12)
  }
}