Compose a piece of music that follows both the given musical theme and the letter-based structure provided.
X:1
L:1/8
M:6/8
K:D
['fdd edd dBA B2 A Bee', 'dff Bff dff fed cee', 'faa fed']  
X:1
L:1/8
M:6/8
K:D
|: a | fdd edd | dBA B2 A | Bee ede | faa efg | fdd edd | dBA B2 A | Bee caa | fdc d2 :: c | 
 dff Bff | dff fed | cee Aee | cee gfe | dff Bff | dff fed | cee Aaa | fdc d2 :: e | faa fed | 
 Bdd dBA | faa fed | Bee ede | faa fed | Bdd dBA | Bee caa | fdc d2 :|  