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
['D2 FD ADFA defd B3 c dBBA', 'dcde fefg afdf gfed cdef']  
X:1
L:1/8
M:4/4
K:D
 A, | D2 FD ADFA | defd B3 c | dBBA dBBA | FADE FE E2 | D2 FD ADFA | defd B3 c | dBBA FAdB | 
 AFEG FDD :| A | dcde fefg | afdf gfed | cdef gebe | gebe gfec | dcde fefg | afdf gfed | 
 cdef gbag | fgec d3 e | fdec d3 e | fded B3 c | dBBA dBBA | FADE FE E2 | D2 FD ADFA | defd B3 c | 
 dBBA FAdB | AFEG FDD :|  