Create harmonious melodies following the given letter notation and incorporating the designated theme.
X:1
L:1/8
M:6/8
K:G
['DGB dCA', 'g3 gef']  
X:1
L:1/8
M:6/8
K:G
|: DGB dCA | GEF DEF | DGB dCA | AGF G2 E | DGB dCA | G3 A3 | fed CAd | GAF G3 :: GBd g3 | 
 gef def | CBA a3 | bag e3 | dBd g3 | gef g3 | fed Cad | GFG G3 :|  