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
['Acd efe', 'Acd efe dcB', 'ABc B2 d dcd ecA ABc efe']  
X:1
L:1/8
M:6/8
K:D
|: Acd | efe dcd | ecA Acd | efe dcB | c2 A Acd | efe dcd | ecA Acd | efe dcB |1 A3 Acd :|2 
 A3 agf |: ecf ecd | ecA Acd | efe dcB | c2 A agf | ecf ecd | ecA Acd | efe dcB |1 A3 agf :|2 
 A3 ABc |: B2 d dcd | ecA ABc | B2 d dcB | c2 A ABc | B2 d dcd | ecA ABc | efe dcB |1 A3 ABc :|2 
 A3 Acd ||  