Develop a musical piece using the given theme and incorporating the letter-based structure provided.
X:1
L:1/8
M:4/4
K:D
['dcdA (3Bcd AF DFAF GEEc dcdA Bd', 'd2 d>fa>f b>ga>f dfaf geef dfaf bgaf', 'd2 dfaf bgaf dfaf geeg fdec d2']  
X:1
L:1/8
M:4/4
K:D
|: dcdA (3Bcd AF | DFAF GEEc | dcdA Bd AF | dfeg fd d2 :: d>fa>f b>ga>f | dfaf geef | dfaf bgaf | 
 gfeg fd d2 || dfaf bgaf | dfaf geeg | fdec d2 AF | DF Ad fd d2 :|  