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} G2 G c- | c c c2 | c c c c | c d c c ||{/B} c c c{/d} c | B2 G G G2 c c | B2 G2 || %7
{/B} c2 e f | e2 c c | c !turn!c2 B | B2 G2 ||{/^F} G G G{/G} E | =F E E E | E/ F/ G/ A/ F/ G/ F | %14
 E2 C C || %15  