Create a musical composition based on the alphabetic representation of the predetermined pattern and the given melodic theme.
X:1
L:1/8
Q:1/4=116
M:2/2
K:G
['GBBG BddB', 'BcdB gBcB']  
X:1
L:1/8
Q:1/4=116
M:2/2
K:G
 GBBG BddB | GBBG AG F/E/D | GBBG BddB | AcBA BG G2 :: BcdB gBcB | ABcA dcBA | BcdB gBcB | 
 AcBA BG G2 |]  