Utilizing the provided musical theme and letter-based structure, compose a piece of music.
X:1
L:1/8
M:4/4
K:D
['F>DF>A d2', 'f2 f>d g2 g>e']  
X:1
L:1/8
M:4/4
K:D
|: (3BAG | F>DF>A d2 f>e | d2 f>d e>cA>G | F>DF>A d2 f>d | e>cA>F G>B (3BAG | F>D (3FGA d>Af>e | 
 d>A (3fed e>cA>G | (3FED F>A d>Af>d | e>cA>F G2 :: (3cde | f2 f>d g2 g>e | a>ba>g f>dd>e | 
 f2 f>d g2 g>e | a>ba>f g2 (3efg | a>ba>f g2 (3gfe | f2 (3fed e2 (3BAG | F2 D>A d>A (3fed | 
 (3efe A>F G2 :|  