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 c c | c2 c c | c c B G | G c B G ||{/G} E F G B | c B A G | E F G E | F E D C || %8  