\score { \new ChoirStaff << \score_pre \transpose c \pitch_a \new Staff << \Mae \Be >> \lyricsto Vae \Lae \transpose c \pitch_b \new Staff \Mbe \lyricsto Vbe \Lbe \transpose c \pitch_c \new Staff \Mce % \lyricsto Vce \Lce >> \layout { \context { \Voice \consists "Ambitus_engraver" } } }