Dave Grohl has been leading the Foo Fighters through a number of great cover songs of late, but he reserved a very special intro for the group's appearance at Slane Castle in Ireland Saturday (5/30) when Grohl said, 'If I could have been in any other rock bandd in the f&*#ing world, it would be Thin Lizzy. What a band!'' With that said, the Foos tore into a version oof Jailbreak, the title song to Lizzy's 1976 album.