I think the arguments about the choice of song are pretty invalid. Yes, YSMANL isn't ACDC's best but it is the song that made them stars and people really started taking notice of the band. It is regarded as one of their most popular, if not their most popular song. Do you really expect these two to cover Riff Raff, Whole Lotta Rosie, Let There Be Rock, Jailbreak, She's Got the Jack or Big Balls??