Compose a piece of music by integrating the assigned letter representation and provided tune.
X:1
L:1/8
M:4/4
K:C
['', 'BdcA G2', 'af gbag fd d2']  
X:1
L:1/8
M:4/4
K:C
 .abc || |[M:2/2][K:G] TBdcA G2 G2 | ABcA d2 cA | BdcA G2 g2 | fdcA dBcA | BdcA G2 G2 | 
 ABcA d2 cA | BdcA G2 Tg2 | fdcA BG G2 || !fermata!fgaf g2 af | gbag fd d2 | fgaf gbag | 
 fdcA BG G2 | fgaf g2 af | gbag fd d2 | defg abag | fdcA BGAc"_D.C." |]  