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 c2 | c c c c | e !turn!c2 c | !turn!G2 c B || G2 B2 | c2 e d | e f e d | c d c c || %8
{/^F} G2 c B | !turn!G2 =F E | G ^F E =F | E D C C ||{/B,} G, G, B, B, | C2 E F | !turn!G2 E F- | %15
 F E D C ||{/G} E F G B | c2 !turn!G2 | c c e/ d/ c/ B/ | A/ G/ F/ E/ D/ C/ C || %20  