Develop a musical piece incorporating the designated alphabet-based pattern and the supplied melodic theme.
X:1
L:1/8
M:2/2
K:D
['', 'dfed BcdB', 'dB A2 F2', 'F E2']  
X:1
L:1/8
M:2/2
K:D
 (A |: A) f2 f3 e | dfed BcdB | Abde f2 f2 | e3 f e2 [DA]- | [DA] f2 fgfe | dfed BcdB | 
 A2 FD ED C2 |1 D3 E D2 A :| D3 E D2 dB || A2 F2 F2 dB | A DFG F2 dB | A2 F2 FEDE | F E2 F E2 dB | 
 AFDF AFdc | B [GB] A BcdB | A FD ED C2 |1 D3 ED dB :|2 D3 E D4 ||  