Assemble a piece of music by merging the alphabetic representation of the predetermined musical pattern and the provided melodic theme.
X:1
L:1/8
M:4/4
K:G
['GABG ABcA dgfa', 'G2 ga bgdg afdf gece d2 def']  
X:1
L:1/8
M:4/4
K:G
|: DF | GABG ABcA | dgfa g3 | fegc edGB | (3cBA (3BAG ADFA | GABG ABcA | dgfa gfgf | edcB cBAG | 
 D2 F2 G2 :: ga | bgdg afdf | gece d2 def | gagf edGBd | (3cBA (3BAG A2 DFA | GABG ABcA | 
 dgfa gfgf | edcB cBAG | D2 F2 G2 :|  