Craft a piece of music that integrates both the suggested theme and letter-based structure.
X:1
L:1/8
Q:1/4=150
M:2/4
K:D
['Aeeg fdec Aeef gG (B/c/d/B/) Aeeg fdef', 'Ag f/g/a']  
X:1
L:1/8
Q:1/4=150
M:2/4
K:D
 Aeeg | fdec | Aeef | gG (B/c/d/B/) | Aeeg | fdef | gddg | BG (B/c/d/B/) :: Ag (f/g/a) | fdec | 
 Ag f/g/a | BGdB | Ag f/g/a | fdef | gddg | BG (B/c/d/B/) :|  