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:D
['d2 fd', '(3(FED) (AD)']  
X:1
L:1/8
M:2/2
K:D
 d2 fd AFDF | d2 fd egfe | d2 fd AFDF | GEFD EDB,A, | d2 fd AFDF | d2 fd egfe | d2 fd AFDF | 
 dfeg fd d2 || (3(FED) (AD) BDAD | (3(FED) (AD) CEEG | (3(FED) (AD) BDAD | GEFD A,DDG | 
 (3(FED) (AD) BDAD | (3(FED) (AD) CEEG | FAdf ecdB | Agfe fd d2 |]  