Create a musical composition employing the given alphabetic structure and melodic theme.
X:1
L:1/8
Q:1/8=180
M:6/8
K:G
['G2 B', 'd3 dcB def gdB']  
X:1
L:1/8
Q:1/8=180
M:6/8
K:G
|: GBA G2 B | def geB | ABA G2 B | ABA AFD | GBA G2 B | def geB | ecA dBG | FDF G3 :: d3 dcB | 
 def gdB | d3 dcA | ABA AFD | d3 dcB | def gdB | ecA dBG | FDF G3 :|  