The default track list is pretty shitty, far too many 'obscure' American (and British) bands for my liking. Sorry folks. Give me more classic Rock and big name bands, please! Or at least songs that are full on balls to the wall Rock you can play and sing along too.
Eagles
Queen
Led Zep
Motorhead
Metallica
Anything along those lines.
There's a few Queen and Led Zep and a shitload of Metallica available on Smithy's Anvil. Might be a Motorhead song or two as well, can't remember now. Couple of Blondie songs too. AC/DC, Judas Priest, Sex Pistols, The Jam...the list is huge. You'll need to bung a dll file into your Rocksmith root folder for the PC versions or a modded 360 for the 360 versions. Don't think there's a way to play them on the PS3 though.