Design a musical composition incorporating the alphabetic expression of the chosen structure and the provided melodic theme.
X:1
L:1/8
Q:1/8=180
M:2/2
K:D
['FDAD BDAD', 'd2 fd']  
X:1
L:1/8
Q:1/8=180
M:2/2
K:D
 FDAD BDAD | FDAF E2 EG | FDAD BDAD | Bdce dBAG | FDAD BDAD | FDAF E2 EG | FDAD BDAD | 
 Bdce d2 d2 || d2 fd edfd | d2 fd e2 e2 | d2 fd edfd | agfe dABc | d2 fd edfd | d2 af e2 e2 | 
 agfe dcBA | Bdce dBAG |]  