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 G2 | B2 B2 | c c2 c | c d c2 ||{/B} c2 !turn!c2 | B2 G2 | G2 B B | c B !turn!G2 || %8
{/C} B, C{/F} E F | G G B c | e/ d/ c/ B/ A/ G/ F/ E/ | F/ A/ G/ F/ E/ D/ C || %12  