Utilizing the provided musical theme and letter-based structure, compose a piece of music.
X:1
L:1/8
M:4/4
K:C
['[M:2/2][K:D] .abc (3.D.D.D FD ADFD Adde fded', '(3.d.d.d (fd) adfd']  
X:1
L:1/8
M:4/4
K:C
[M:2/2][K:D] .abc (3.D.D.D FD ADFD | Adde fded | cAAB =c2 cd | ea{b}ag edcd | (3.D.D.D FA defd | 
 cAAB cdeg | fdec d2 cA | BdAF EDEA || (3.d.d.d (fd) adfd | ecAB cdec | (3.d.d.d (fd) adfd | 
 cdeg (fd) d2 | (3.d.d.d (fd) adfd | cdef g2 (fg) | (3agf ge fdec | dBAG (FD) D2 |]  