Create a musical composition based on the alphabetic representation of the predetermined pattern and the given melodic theme.
X:1
L:1/8
M:4/4
K:G
['', 'B3 G cBAG', 'A3 G']  
X:1
L:1/8
M:4/4
K:G
 (3FGA |: B3 G cBAG | G3 D D3 G/A/ | B3 G cBAG | A6 BB/A/ | G2 gg/f/ e4 | dgdB c4 | 
 cBAG e d2 c/B/ |1 A3 G G3 G/A/ :|2 A3 G G2 Bd || e3 c gfed | d3 f/g/ dd/c/ BG | 
 c2 c/d/e dd/c/ BB/d/ | A6 GG/F/ | EE/D/ EF G3 G/A/ | B2 B/A/G/F/ G3 A/B/ | cBAG e d2 c/B/ | 
 A3 G G3 B/d/ | e2 aa/b/ gfed | d3 f/g/ dd/c/ BG | c2 c/d/e dd/c/ BB/d/ | A6 BB/A/ | G2 gg/f/ e4 | 
 dgdB c4 | cBAG e d2 c/B/ |1 A3 G G3 G/A/ :|2 A3 G G4 ||  