Compose a piece of music by integrating the assigned letter representation and provided tune.
X:1
L:1/8
M:4/4
K:G
['', 'd2 cA', 'fgaf g2 fd dcAc']  
X:1
L:1/8
M:4/4
K:G
 vdcS |: BABc dcAc | BGGB d2 cA | BABc d2 cA | d2 cA BG G2 :| fgaf g2 fd | dcAc d2 de | 
 fgaf g2 fd | dcAc BG G2 | fgaf g2 fd | dcAc d2 cA | fgaf gbag | fdcA BG"_D.C."AcS |]  