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} B | B2 B c | c2 c c | c d c c ||{/B} c c c c | B2 G G | G G B B | c B/ A/ ^F G || %8
{/G} E =F E F | G G B2 | c e B c | B B ^F G ||{/^F} G B c d | c B G G | G2 F E | F E/ D/ B, C || %16  