Create a composition by utilizing the given alphabet-based musical pattern and the provided melodic theme.
X:1
L:1/8
M:4/4
K:G
['(3dcB cA', 'dBGB ceAc BDGB cedB ABcd ecgf e3']  
X:1
L:1/8
M:4/4
K:G
|: G2 G2 GBDG | BDGB GBAG | c3 e dBgB | cAAG AEGA | G3 D GBdc | BDGF GBAG | cefg defg |1 
 (3dcB cA G4 :|2 (3dcB cA GABd |: e3 d egfe | dBge dBGB | ceAc BDGB | cedB ABcd | ecgf e3 d | 
 cd e2 dBGE | DBBD (3GAB ce |1 FGAB GABd :|2 FGAB G4 ||  