Generate a piece of music. It is monophony.  
X:1
T:Music21 Fragment
C:Music21
L:1/8
Q:1/4=64
M:2/4
I:linebreak $
K:D
V:1 treble 
V:1
 A | DD EE | FA d>B | AE EA | FE D z/ A/ | DD EE | FA !fermata!d>B | A2 E>A | FD z A | Ae dc | %10
 dA A z/ A/ | dA GF | FE EA | DD EE | FA !fermata!d z/ B/ | A2 E>A | FD z2 | d2 A>A | BA z A | %19
 dA GF | FE z D | DD EE | FA !fermata!d>B | A2 E>A | FD z x || %25  