Utilizing the provided musical theme and letter-based structure, compose a piece of music.
X:1
L:1/8
M:2/2
K:D
['f2 af gfed', 'cdef gece']  
X:1
L:1/8
M:2/2
K:D
 e2 |:"D" f2 af gfed |"D" f2 af gfed |1"A" e2 ef gfed | edef gfed :|2"A" cdef gece | 
"D" df"A"ec"D" d2 |]: ef |"G" gB B2 gBaB |"G" gB B2 gfed |1"A" cA eA fAeA | cAef gf :|2 
"A" cdef gece |"D" df"A"ec"D" d2 |]  