Craft a piece of music that integrates both the suggested theme and letter-based structure.
X:1
L:1/8
M:4/4
K:D
['FG Addc', 'AG FAdA FAdA FAGE']  
X:1
L:1/8
M:4/4
K:D
|: FG | Addc dBAG | F2 D2 D2 FD | Eeef ecAF | G2 E2 E2 FG | Addc d2 FE | DEFE DFAF | GBec dBAG | 
 F2 D2 D2 :: AG | FAdA FAdA | FAGE D2 AF | GB(3BAB GBBG | FAFD E2 AG | FAdA FAdA | FAGE DFAF | 
 GBec dBAG | F2 D2 D2 :|  