The New Musical Express, which is sort of the UK analogue to the US' Rolling Stone, says it got its hands on the list of 84(!) bands in Guitar Hero 5. All they say is who is playing, not what songs will be played.
We had a partial list of confirmed bands when the game's release date was announced Tuesday. NME's web presence posted the list earlier today; they didn't say how they'd gotten it. But if it's accurate, then it's quite a range (Iron Maiden to Elton John) and a hell of a long list. Let's also note that this doesn't specify whether all these bands are on the retail release, if some are available later through DLC, or if any are not part of GH5 but considered part of the game because the songs were part of earlier versions. It's just a list of bands, in other words.
Band Of Horses Bush Darkest Hour Blur Kiss Blink-182 Iron Maiden Wild Cherry Muse The White Stripes Jimmy Eat World Bob Dylan Gorillaz Beastie Boys The Raconteurs Coldplay Duran Duran Tom Petty Nirvana Public Enemy Featuring Zakk Wylde Queens Of The Stone Age The Sword AFI Rush Doors Down Smashing Pumpkins David Bowie Mötley Crüe Attack! Attack! Dire Straits Johnny Cash The Derek Trucks Band Sublime Wolfmother Rammstein Beck Garbage Billy Squier My Morning Jacket Kaiser Chiefs Brand New Santana Bon Jovi Weezer Billy Idol Elliott Smith A Perfect Circle Sonic Youth Kings Of Leon The Bronx Queen & David Bowie Screaming Trees The Killers Vampire Weekend TV On The Radio John Mellencamp Scars On Broadway The Rolling Stones Stevie Wonder Face to Face Peter Frampton No Doubt Iggy Pop Spacehog Thin Lizzy The Police Children of Bodom Elton John Arctic Monkeys Thrice Rose Hill Drive Tom Petty & The Heartbreakers Deep Purple Darker My Love Jeff Beck Love and Rockets The Duke Spirit Sunny Day Real Estate King Crimson T. Rex Gov't Mule Eagles Of Death Metal Grand Funk Railroad Megadeth
Arctic Monkeys, Nirvana, Blur for 'Guitar Hero 5' [NME.com, thanks Josh and Mark]