Create a musical composition employing the given alphabetic structure and melodic theme.
X:1
L:1/8
M:4/4
K:G
['gedB G2 AB cABG', 'gfga bagf gfed B2 AG']  
X:1
L:1/8
M:4/4
K:G
|: gedB G2 AB | cABG AGEG | (3DEG Bd g2 fe | fgag fdef | gedB G2 AB | cABG AG E2 | cABG AGEG | 
 DEGA G4 :: gfga bagf | gfed B2 AG | EGAB cBAG | EGAB cdef | gfga bagf | gfed B2 AG | cABG AGEG | 
 (3DEF GA G4 :|  