Create a composition by utilizing the given alphabet-based musical pattern and the provided melodic theme.
X:1
L:1/8
M:6/8
K:G
['GBd gba gdB{d} c2', 'gba gdB ecA dBG']  
X:1
L:1/8
M:6/8
K:G
|: GBd gba | gdB{d} c2 e | dcB{d} c2 e | dcB A2 D | GBd gba | gdB{d} c2 f | gdB cAF | AGF G2 D :: 
 gba gdB | ecA dBG | DEG B3 | edB A2 d | gba gdB | ecA dBG | cec BdB | DFA G2 D :|  