Design a musical composition incorporating the alphabetic expression of the chosen structure and the provided melodic theme.
X:1
L:1/16
M:2/4
K:none
['FDFA dfaf gefd ecBA', 'd2f2d2 A2 dfdf cece Bcde dcBA GBGB']  
X:1
L:1/16
M:2/4
K:none
[K:D] A2 | FDFA dfaf | gefd ecBA | GBGB FAFA | EFGA GFED | FDFA dfaf | gefd ecBA | afdf gecA | 
 d2f2d2 :: A2 | dfdf cece | Bcde dcBA | GBGB FAFA | EFGA GFED | FDFA dfaf | gefd ecBA | afdf gecA | 
 d2f2d2 :|  