Compose a piece of music that follows both the given musical theme and the letter-based structure provided.
X:1
L:1/8
Q:1/8=180
M:4/4
K:D
['D2 FA', 'd2 f4 fedc (3Bcd AddAd fded fded']  
X:1
L:1/8
Q:1/8=180
M:4/4
K:D
 D2 FA d2 AF | GFEF GFEF | D2 FA dfed | (3Bcd eg fd d2 :| f4 fedc | (3Bcd AddAd | fded fded | 
 ABde fd d2 | fdeg fded | BdAd (3Bcd AB | d2 ef gfge | a2 ag fd d2 |]  