Craft a piece of music that integrates both the suggested theme and letter-based structure.
X:1
L:1/4
M:2/4
K:Bbmin
['e d', 'd/c/d/e/ d d/c/ A B']  
X:1
L:1/4
M:2/4
K:Bbmin
 B f f e | d e d c | A d c c/B/ | A B B2 :: d/c/d/e/ d d/c/ | A B B/A/B/c/ | d/c/d/e/ d d/c/ | 
 A B B2 :|  