Create a musical composition employing the given alphabetic structure and melodic theme.
X:1
L:1/8
M:3/4
K:G
['gf af c2 cB dB GB', 'Ac AF', 'c2 Ac BA B2 GB AG FA']  
X:1
L:1/8
M:3/4
K:G
|: d2 | gf af c2 | cB dB GB | B2 Ac AF | G2 Bd g2 | gf af c2 | cB dB GB | BA Ac AF | G2 G2 :: D | 
 F2 Ac AF | G2 Bd BG | F2 Ac AF | G2 Bd B2 | c2 eg ec | cB dB GB | BA Ac AF | G2 G2 :: B | 
 c2 Ac BA | B2 GB AG | FA Ad fa | g2 bg dB | c2 Ac BA | B2 GB AG | FA Ad fa | g2 g2 :|  