Compose a piece of music that follows both the given musical theme and the letter-based structure provided.
X:1
L:1/4
Q:1/2=88
M:2/2
K:Ddor
['D E']  
X:1
L:1/4
Q:1/2=88
M:2/2
K:Ddor
 A | A F G A | F E/F/ D A | A F G A | F2 D A | A F G A | F E/F/ D A | A F G A | D3 E | E C D E | 
 F E/F/ D E | E C D E | F2 D E | E C D E | F E/F/ D E | E C D E | D3 |]  