Compose a musical piece using the designated musical pattern's alphabetic representation and the assigned melodic theme.
X:1
L:1/8
M:2/2
K:D
['defe dBBA B2', 'afdf bafe']  
X:1
L:1/8
M:2/2
K:D
 D3 E F3 A | defe dBBA | B2 dB- BdAB | dfaf e2 dB | AD D2 FDFA | defe dBBA | B2 Ad BdAc | 
 dcdA FD D2 :: f^gab afdf | bafe fedB | d2 f^g a2 fa | bfaf e3 a | fa a2 afdf | bafe fedA | 
 B2 Ad BdAc |1 dcdA FD D2 :|2 dcdF GEFE |]  