Generate harmonious tunes by incorporating the specified letter-based framework and the presented motif.
X:1
L:1/8
M:4/4
K:G
['gfed efge', 'g4 gabg af d2 efge dB G2', 'g4 BcdB cd e2 ABcA Bc d2']  
X:1
L:1/8
M:4/4
K:G
|: gfed efge | dcBA Bc d2 | gfed efge | fgaf g4 :: gabg af d2 | efge dB G2 | abc'a d'bgb | 
 c'afa g4 :: BcdB cd e2 | ABcA Bc d2 | G3 B cBAd | cAB/c/A G4 :|  