Generate a piece of music.  
X:1
T:Music21 Fragment
C:Music21
L:1/4
M:none
I:linebreak $
K:none
V:1 treble 
V:1
{/^F} G G{/G} c2 | c2 c2 | c2 e !turn!c- | c c B G ||{/^F} G2 c2 | B4 | E F !turn!G2 | E F E C || %8
{/C} B,2 G, B,- | B, B, C2 | E C2 C | B B G G || G2{/G} E F | E2 C2 | z z z z | z z z z || %16  