…PianoStaff << \new Staff = up \relative c' { << { r4 \override Stem.cross-staff = ##t \override Stem.length = #19 % this is … …lengthened % upwards, so here we must lower the stem by the amount % equal to the lengthening - … …case (19 - 7) / 2 % (7 is default stem length) e e e } { s4 \change Staff = "bottom" \…