\version "2.18.2"
scoreABassoonI = \relative c {
bes8. g16 ees4) \oneVoice r8.\voiceOne ees16( %12
des8. ees16 f4 ees8. des16 %13
}
scoreABassoonII = \relative c {
g8. e16 c4) \oneVoice r8.\voiceTwo c( %8
aes'8. g16 f4 e8. f16 %9
}
scoreABassoonIPart = \new Staff \with {
instrumentName = \markup\column {"Fag I" "Fag II"}
shortInstrumentName = \markup\column {"Fag I" "Fag II"}
midiInstrument = "bassoon"
} << \new Voice { \voiceOne \clef bass \scoreABassoonI }
\new Voice { \voiceTwo \clef bass \scoreABassoonII }
\score {
<<
\scoreABassoonIPart
>>
}