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
['F2 G A2 d', 'e2 d']  
X:1
L:1/8
M:6/8
K:D
 F2 G A2 d | F2 G A2 d | B2 B e2 d | ced cBA | F2 G A2 d | F2 G A2 d | Bed cBc | d3 d2 :: 
 e2 d c2 f | e2 d c2 f | e2 d c2 B | A2 G F2 f | e2 d c2 f | e2 d c2 f | efd cdB | ABG FGE | 
 F2 G A2 d | F2 G A2 d | B2 B e2 d | ced cBA | F2 G A2 d | F2 G A2 d | Bed cBc | d3 d2 :|  