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:6/8
K:G
['B2 B']  
X:1
L:1/8
M:6/8
K:G
 d2 d B2 B | dcB A2 z | B2 B ^c2 c | d3 z3 | c2 c B2 B | c2 d e2 z | d2 BdcA | G3 z3 |]  