Craft a piece of music that integrates both the suggested theme and letter-based structure.
X:1
L:1/8
M:2/4
K:D
['A>B AF A2 d>e ff/g/ ee/f/', 'z d ggec dfaf ggec d/e/f/g/ aA']  
X:1
L:1/8
M:2/4
K:D
 A | A>B AF | A2 d>e | ff/g/ ee/f/ | e/d/c/B/ A/B/c/d/ | A>B AF | A2 d>e | ff/g/ ee/f/ | d2 z :: 
 d | ggec | dfaf | ggec | d/e/f/g/ aA | A>BAF | A2 de | ff/g/ ee/f/ | d2 z :|  