Generate a piece of music.  
X:1
T:Music21 Fragment
C:Music21
L:1/4
M:3/4
I:linebreak $
K:F
V:1 treble 
V:1
 c/>B/ | A A F | G G C | G/ G/ G/ G/ B/ G/ | A c c3/4 B/4 | A A F | G G C | G/ G/ B E | %8
 !fermata!F2 x |] F x2 | E c c | c2 B/ c/ | d B G | F c/ z/ F | E c c | c2 B/ c/ | d B G | %17
 c3/2 c/ c/ c/ | !fermata!c2 x || %19  