Compose a piece of music that follows both the given musical theme and the letter-based structure provided.
X:1
L:1/8
M:2/2
K:D
['A2 FA', 'Adfd Adfd']  
X:1
L:1/8
M:2/2
K:D
 A2 FA A2 FA | B2 GB B2 GB | A2 FA A2 FA | EFGA BcdB | A2 FA A2 FA | B2 GB B2 GB | AdcB AGFE | 
 DDCE D2 :: Adfd Adfd | Acec Acec | Adfd Adfd | cABc d2 cB | Adfd Adfd | Acec Acec | d2 cB AGFE | 
 DDCE D2 ||  