Craft a piece of music that integrates both the suggested theme and letter-based structure.
X:1
L:1/8
M:3/4
K:D
['D2 D2', 'z2 (fe) d4 (fe) dA FA dc']  
X:1
L:1/8
M:3/4
K:D
|: (FA) | D2 DD DD | D2 D2 D2 | FA GB Ac | (Bd) ce d2 | c2 cc cc | (c2 B2) c2 | d2 dd dd | 
 e2 d2 e2 | f2 ff ff | (fd) Ad fa | g2 gg gg | (ae) ce gb | a2 aa aa | (af) dA FA | G2 E2 c2 | 
 d2 z2 :: (fe) d4 (fe) | dA FA dc | BA Bg fe | dc df a2 | d'3 c' ba | b3 e fg | (ab) af ge | 
 d2 z2 :|  