Develop a musical piece incorporating the designated alphabet-based pattern and the supplied melodic theme.
X:1
L:1/8
Q:1/4=140
M:4/4
K:D
['DFAd fd-df edcB cA-Ac dBAG FAdB', 'D4 fafd egec dfdB cecA Bcde fdcB']  
X:1
L:1/8
Q:1/4=140
M:4/4
K:D
 DFAd fd-df | edcB cA-Ac | dBAG FAdB | AGFE D4 :: fafd egec | dfdB cecA | Bcde fdcB | caB^g a4 | 
 DFAd fd-df | edcB cA-Ac | dBAG FAdB | AGFE D4 :|  