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
['Bc dB ge dB ed BG DG', 'gb ag fa gf eg fe fd']  
X:1
L:1/8
M:4/4
K:G
 Bc | dB ge dB ed | BG DG A2 AG | FG AB cd ef | (3gba (3gfe dc Bc | dB ge dB ed | BG DG A2 AG | 
 FG AB cd ef | (3gfg ba g2 :| ef | gb ag fa gf | eg fe fd Bd | gb ag fa gf | eg fe fd Bd | 
 (3cdc Ac (3BdB GB | (3ABA FA GF EF | DE FG AB cA | (3GBd (3gdB G2 :|  