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
['G2 BG', 'ABcA d2 BG dGGB']  
X:1
L:1/8
M:4/4
K:G
 G2 BG DGBG | G2 BG ABcA | G2 BG DGBG | AGFG ABcA :| d2 BG dGGB | dGBG ABcA | d2 BG dGGB | 
 AGFG ABcA | d2 BG dGGB | dGBG ABcA | dBcA BGAF | DEFG ABcA ||  