Compose a piece of music that follows both the given musical theme and the letter-based structure provided.
X:1
L:1/16
Q:1/4=84
M:2/4
K:D
['Adce dcBA FDDD D4 Adce dfeg', 'Adcd Adcd']  
X:1
L:1/16
Q:1/4=84
M:2/4
K:D
 Adce dcBA | FDDD D4 | Adce dfeg | fddd d2G2 | Adce dcBA | FDDD D4 | Adce dfeg | fddd d4 :: 
 Adcd Adcd | Adcd edcd | Bece Bece | Bece fecd | Adcd Adcd | Adcd edcd | BABc dcde | f2dd d4 :|  