2 %{ When entering half music (I.e. for students to complete by hand)
3 you need the spacing to correspond to the timing - all measures same length, etc.
4 This thing implements it by adding invisible staff with lots of fast notes.
10 quickmeasure = \notes {[\repeat unfold 16 c''16]}
11 mel = \notes \relative c' {c16 d16 e8 a4 g2 e8 d c2. g'1 e4 d c2}
14 \context PianoStaff \notes <
17 \context Voice=melo {\mel}
18 \context Voice=invisible {
19 \property Voice.NoteHead \override #'transparent = ##t
20 \property Voice.Stem \override #'transparent = ##t
21 \property Voice.Beam \override #'transparent = ##t
22 \repeat unfold 4 \quickmeasure
25 \context Staff = empty \notes {\clef F; s1*4}