Develop a musical composition using the outlined alphabetical depiction of the structure and the provided theme.
X:1
L:1/16
M:2/4
K:G
['g2>a2 gfed eaab agef', 'DGBG dGBG']  
X:1
L:1/16
M:2/4
K:G
|: g2>a2 gfed | eaab agef | gfga gedB | fedc BGG2 | g2>a2 gfed | eaab agef | gafg egdB | 
 cedc BGG2 :: DGBG dGBG | FGAB cAFA | DGBG dGBG | cedc BGG2 | DGBG dGBG | FGAB cAFA | DGBG dGBG | 
 Aedc BGG2 :|  