\version "2.16.1" \include "definitions.ily" \include "clementi-op42-mus-L12-mozart.ily" % LESSON XII. Arietta by Mozart. \book { \bookOutputName "clementi-op42-les12-mozart-arietta" \score{ % LESSON XII: Andante. MIDI \new PianoStaff << \new Staff = "upper" \LessonXIIUpperMIDI \new Staff = "lower" \LessonXIILowerMIDI >> \midi { } } }