\version "2.19.56"

\layout {
  \context {
    \Staff
    \name "BassClt"
    \alias Staff
    \clef "treble"
    instrumentName = \markup { \center-column { "Bass" "Clarinet" } }
    shortInstrumentName = "BCl"
  }
  \context {
    \Staff
    \name "Bassoon"
    \alias Staff
    \clef "bass"
    instrumentName = "Bassoon"
    shortInstrumentName = "Bsn"
  }
  \inherit-acceptability "BassClt" "Staff"
  \inherit-acceptability "Bassoon" "Staff"
}

\midi {
  \context {
    \Staff
    \name "BassClt"
    \alias Staff
    instrumentTransposition = #(ly:make-pitch -2 7 -1)
    midiInstrument = "clarinet"
  }
  \context {
    \Staff
    \name "Bassoon"
    \alias Staff
    midiInstrument = "bassoon"
  }
  \inherit-acceptability "BassClt" "Staff"
  \inherit-acceptability "Bassoon" "Staff"
}

music = { \key c\major c4 d e f g a b c' }

\score {
  \new StaffGroup <<
    \new Bassoon { \music }
    \new BassClt { \transpose bes c'' \music }
  >>
  \layout{}
  \midi{}
}