5 Beams can be typeset over fixed distance aligned staves, beam
6 beautification does not really work, but knees do. Beams should be
7 behave well, wherever the switching point is.
11 \context PianoStaff <<
12 \new Staff = "one" \relative c'{
13 \stemUp c8[ c \change Staff=two \stemUp c c]
16 \stemDown c8[ c \change Staff=two \stemUp c c]
18 \stemDown c8[ c \change Staff=one \stemDown c c]
21 \stemUp c8[ c \change Staff=one \stemDown c c]
24 \new Staff = "two" \relative c'{