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{/B} c2 | c2 c2 | c2 e !turn!c- | c c B G ||{/^F} G2 c2 | B4 | E F !turn!G2 | ^F2 E =F || %8
 E D C c | B c B c | B B !turn!G2 | G2 B A || c B d2 | c B !turn!G2 | E F E2 | G2 B B || %16  