\version "2.16.1" \include "clementi-op42-mus-L30-prel-besmaj.ily" % LESSON XXX. Prelude in B flat, Major. \book { \bookOutputName "clementi-op42-les30-prel-besmaj" \score { \new PianoStaff << \new Staff = "upper" \LessonXXXUpperPrel \new Staff = "lower" \LessonXXXLowerPrel >> \midi { } } }