Generate a piece of music. It is monophony.  
X:1
T:Music21 Fragment
C:Music21
L:1/8
Q:1/4=82
M:4/4
I:linebreak $
K:C
V:1 treble 
V:1
 e2 dc A>c cd | ed ce d2 z d | e>e dc Ac cd | ed c>d c3 G | GG GG G2 z G | %5
 AB c!fermata!e !fermata!d3 z | e2 dc Ac cd | e<d c>d c3 G | GG GG G2 z G | %9
 AB c!fermata!e !fermata!d3 z | e2 dc Ac cd | e<d c>d c3 x || %12  