Create a composition by utilizing the given alphabet-based musical pattern and the provided melodic theme.
X:1
L:1/8
M:2/2
K:D
['af gecA-', '', 'ABcA BcAB cABc- cB A2 ABdA BdAB']  
X:1
L:1/8
M:2/2
K:D
 af | gecA- A2 af | gecA- AABA | dABA dABA | dABd- d2 af | gecA- A2 af | gecA- AABA | dABA dABA | 
 dABd- ddc=c | B4 d3 e | fefb- bafd | Acea- af e2 | d6 :| z2 |: ABcA BcAB | cABc- cB A2 | 
 ABdA BdAB | dABd- dB A2 | ABcA BcAB | cABc- cB A2 | ABdA BdAB | dABd- ddc=c | B4 d3 e | 
 fefb- bafd | Acea- af e2 |1 d2 d2 c2 B2 :|2 d6 |]  