Utilizing the provided musical theme and letter-based structure, compose a piece of music.
X:1
L:1/8
Q:1/2=80
M:2/4
K:D
['d2 de/f/ e2 ef/g/', 'd2 de/f/ e2 ef/g/']  
X:1
L:1/8
Q:1/2=80
M:2/4
K:D
|: d2 de/f/ | e2 ef/g/ | fafd | ecBA | d2 de/f/ | e2 ef/g/ | fdec | d4 :: fgaf | bgfg | efge | 
 afef | defd | gfed | cdef | e2 A2 | d2 de/f/ | e2 ef/g/ | fafd | ecBA | d2 de/f/ | e2 ef/g/ | 
 fdec | d4 :|  