Design a musical composition incorporating the alphabetic expression of the chosen structure and the provided melodic theme.
X:1
L:1/8
M:2/2
K:Dmix
['fd d2 ABcA dcAd cAGE D2', 'D2 fdd^c defg ad d2 adfa gccB']  
X:1
L:1/8
M:2/2
K:Dmix
 fd d2 ABcA | dcAd cAGE | D2 FD ADFD | (3EFG AB cdeg | fd d2 ABcA | dcAd cAGE | D2 AD (3EFG AB | 
 cAGE ED D2 :: fdd^c defg | ad d2 adfa | gccB cdef | gc c2 gceg | fd d2 ABcA | dcAd cAGE | 
 D2 AD (3EFG AB | cAGE ED D2 :|  