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
['BAB GAB', 'gbg gbg']  
X:1
L:1/8
M:6/8
K:G
 d | B>AB GAB | Tc>Bc ABc | BAB GAB | AFD D2 c | BAB GAB cBc ABc | (B>cdB) cAF | G3 G2 || f | 
 gbg gbg | ac'a ac'a | gbg gbg | afd d2 f | gbg gbg | ac'a abc' | bag ag^f | g3 g2 :|  