Develop a musical piece incorporating the designated alphabet-based pattern and the supplied melodic theme.
X:1
L:1/8
Q:1/4=122
M:2/4
K:C
['C>D EF G2 G2 A>B cA', 'F/G/F/E/ DE']  
X:1
L:1/8
Q:1/4=122
M:2/4
K:C
 C>D EF | G2 G2 | A>B cA | G>F ED | C>D EF | G2 G2 | A>B cA | G3 G :: E>C EG | F/G/F/E/ DE | 
 F>E FA | G/A/G/F/ EG | E>CEG | F/G/F/E/ DE | F>G AB | c3 G :|  