Assemble a piece of music by merging the alphabetic representation of the predetermined musical pattern and the provided melodic theme.
X:1
L:1/4
M:4/4
K:G
['B B']  
X:1
L:1/4
M:4/4
K:G
 D | B B B c/A/ | d3/2 c/ B B | A d/d/ ^c d/e/ | d z2 d | c c A B/c/ | d d G G | c c A A/B/ | 
 G z2 |]  