Compose a piece of music that follows both the given musical theme and the letter-based structure provided.
X:1
L:1/16
M:2/4
K:D
['d^cdf gecA GFGB D2(EF)', 'A2G2G2 (cB) A^GAB cBcd e^def g2(gf) edcBcBAG']  
X:1
L:1/16
M:2/4
K:D
 (Bc) | d^cdf gecA | GFGB D2(EF) | GFGA BABc | dcdf A2(Bc) | d^cdf gecA | GFGB D2(EF) | Gedc BAGF | 
 A2G2G2 :: (cB) | A^GAB cBcd | e^def g2(gf) | edcBcBAG | F2D2D2 (Bc) | d^cdf gecA | GFGB D2(EF) | 
 Gedc BAGF | A2G2G2 :|  