Craft a piece of music that integrates both the suggested theme and letter-based structure.
X:1
L:1/8
Q:1/8=100
M:6/8
K:D
['f>ed AFA', 'a f2 a e2 a']  
X:1
L:1/8
Q:1/8=100
M:6/8
K:D
 d/e/ | f>ed AFA | BGB AFd/e/ | f>ed AFA | Bdc d2 :: a | f2 a e2 a | ded c2 a | f2 a e2 a | 
 ^gfg a2 a | b2 b a2 a | g>fg f2 d/e/ | fed Bgb | a2 c d2 :|  