Generate a piece of music.  
X:1
T:Music21 Fragment
C:Music21
L:1/8
M:none
I:linebreak $
K:none
V:1 treble 
V:1
{/E} F4 E2 F2 | G4 B2 B2 | c4 c2 c2 | c2 d2 c4 || G4 B4 | B4 c c B B | A B c d- d2 c2 | %7
 !turn!G4 F2 E2 ||{/C} B,2 C2 E2 F2 | G2 B2 c2 c2 | G G B c e d c B | A G F E D C B, C || %12  