Generate harmonious tunes by incorporating the specified letter-based framework and the presented motif.
X:1
L:1/8
Q:1/8=180
M:6/8
K:G
['GAB EFG', 'BGB dBd ece d2']  
X:1
L:1/8
Q:1/8=180
M:6/8
K:G
|: D | DGG GFG | ABA AGF | GBd dcB | AcB AGF | GAB EFG | DGF G2 G | GAB EFG | DGF G2 :: G | 
 BGB dBd | ece d2 d | BGB dBd | ece d2 B | cec BdB | AcB AGF | GAB EFG | DGF G2 :|  