Compose a piece of music by integrating the assigned letter representation and provided tune.
X:1
L:1/8
M:4/4
K:D
['cdef geag', '[FB]4 [Fd]4 [Fd]4 [FBf]4 [FBf]2 [Fd]2 [FB]2', 'a4 a4']  
X:1
L:1/8
M:4/4
K:D
|:"D" a3 f gfed | faaf gfed |"A7" cdef geag |1 fgaf gfed :|2 (3faf (3efe"D" defg |:"D" a3 f gfed | 
 faaf gfed |"A7" cdef geag |1 fgaf gfed :|2 (3faf (3efe"D" d2 ed |:"A7" cdef geag |"D" fAdf gfed | 
"A7" cdef geag |"D" feed"^(Db/F)" =f2"^(D/F#)" ^f2 |"A7" ABcd efge |"D" fAdf efge | 
"A" a2 a^g a=gfe |1"A7" cdef gfed :|2"A7" fdec d2"F#7" _B2 |:"Bm" [FB]4 [FB]4 | [Fd]4 [Fd]4 | 
 [FBf]4 [FBf]2 [Fd]2 | [FB]2 BA B2 | Bdfb ^abaf | ^abfd e/f/e dB | a^ggf =f2 ^fd | 
 =fg ^f3 e d/e/f |"D" a8 | a8 | a4 a4 | a4 a4 | fadf e2 d2 | fadf e2 d2 |"F#7" feed dccB | 
 cd"Bm" (B2 B4) :|  