\score { \new ChoirStaff << \score_pre \transpose c \pitch_sop \new Staff << \Msop \BS \PB >> \lyricsto Vsop \Lsop \transpose c \pitch_alt \new Staff \Malt \lyricsto Valt \Lalt \transpose c \pitch_ten \new Staff \Mten \lyricsto Vten \Lten \transpose c \pitch_bas \new Staff \Mbas \lyricsto Vbas \Lbas >> \layout { \context { \Voice \consists "Ambitus_engraver" % keySignature = #'() } } }