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 Bcd e2 e e3', 'g3 f3']  
X:1
L:1/8
M:6/8
K:G
|: B2 B Bcd | e2 e e3 | d2 d d2 e | d2 c B2 A | B2 B Bcd | e2 e e3 | def gdB | ABA G3 :: g3 f3 | 
 e3 d3 | g3 f3 | efe d2 c | B2 B Bcd | e2 e e3 | def gdB | ABA G3 :|  