5 Slurs should look nice and symmetric. The curvature may increase
6 only to avoid noteheads, and as little as possible. Slurs never
7 run through noteheads or stems.
15 \stemBoth a ( \stemDown a \stemBoth a) a( c a) a( e' a,) a( g' a,)
19 \stemBoth c ( \stemUp c \stemBoth c) c ( a c) c( d, c') c( f, c')