Generate a piece of music.  
X:1
T:Music21 Fragment
C:Music21
L:1/4
M:4/4
I:linebreak $
K:C
V:1 treble 
V:1
 C/D/ | E E E D/>E/ | F F G G/>F/ | E D/C/ D D | C3 D | E E E D/>E/ | F F G G/>F/ | E D/C/ D D | %8
 C3 G | A G G c | G E F G | A G G/F/ E | D C2 C/>D/ | E E E D/>C/ | F F G G/>F/ | %15
 E/ F/4E/4 D/C/ D D | C3 x || %17  