Utilizing the provided musical theme and letter-based structure, compose a piece of music.
X:1
L:1/16
M:2/4
K:G
['GDGB dGBd gfed cBAG ABcd', 'G2G2G2 (FG) ADFD ADFD cDBD A2(GA) BDGD']  
X:1
L:1/16
M:2/4
K:G
 D2 | GDGB dGBd | gfed cBAG | ABcd ecAG | GFAF D2(EF) | GDGB dGBd | gfed cBAG | ABcd ecAF | 
 G2G2G2 :: (FG) | ADFD ADFD | cDBD A2(GA) | BDGD BDGD | dDcD B2D2 | GDGB dGBd | gfed cBAG | 
 ABcd ecAF | G2G2G2 :|  