Compose a piece of music by integrating the assigned letter representation and provided tune.
X:1
L:1/8
M:4/4
K:D
['D2 FE FAAB dafd Beef', 'd B B2 ABdf af f2 bf']  
X:1
L:1/8
M:4/4
K:D
|: D2 FE FAAB | dafd Beef | d2 fd BddB | AdFD E3 F | D2 FE FAAB | dafd Beef | bafd BedB | 
 AFEF (D D3) :: d B B2 ABdf | af f2 bf f2 | dB B2 ABdA | BdAB FEEF | d B B2 ABdf | af f2 bf f2 | 
 dB B2 ABdA | BdAB FEEF :|  