Develop a musical piece incorporating the designated alphabet-based pattern and the supplied melodic theme.
X:1
L:1/8
M:6/8
K:D
['dAF G2 B AFD E2 F DED', 'B2 A F2 A']  
X:1
L:1/8
M:6/8
K:D
|: f/e/ | dAF G2 B | AFD E2 F | DED F2 A | d2 e f2 e | dAF G2 B | AFD E2 F | DED F2 E | DED D2 :| 
 F/A/ | B2 A F2 A | B2 A F2 A | B2 A F2 A | dcd d2 A | B2 A F2 A | B2 A F2 A | EFG F2 E | DED DFA | 
 B2 A F2 A | B2 A F2 A | B2 A F2 A | d2 e f2 e | ded cdc | BcB AFA | Bcd edB | d2 e f2 ||  