Create a musical composition based on the alphabetic representation of the predetermined pattern and the given melodic theme.
X:1
L:1/8
M:2/4
K:G
['b a2 g2 f/g/ a2', 'd2 c2 B/g/f/e/']  
X:1
L:1/8
M:2/4
K:G
 dd/B/ GG | G2 z e | dB cB | BA z b | a2 g2 | f/g/ a2 b | a2 g2 | f/g/ a2 g | fe/d/ e/g/e/c/ | 
 d2 D2 :: aa/f/ dd | d2 z d' | d'c' c'b | ad z e | d2 c2 | B/g/f/e/ de | d2 c2 | B/g/f/e/ dc | 
 BA/G/ A/c/A/F/ | G2 G,2 :|  