'Guitar Hero III' Picks Up 11 New Tracks
On May 23, 2007, Activision announced 11 songs that will appear in the game. IGN revealed two more tracks on May 31. A trailer for the game revealed two more tracks on July 9. Users from the ScoreHero forum reported 4 additional songs on July 25, 2007. The list includes both cover songs (indicated by the phrase "as made famous by") and master tracks, featuring performances by the song's original artist.
But, as of August 2, 2007, 11 new tracks have been released
Lead developer Alan Flores states in a GameSpot interview that there will be "over 70 songs", over half of which will be master recordings, on the final soundtrack for the game.
The latest tracks are:
Miss Murder (by AFI)
Through Fire and Flames (by Dragonforce)
Number of the Beast (by Iron Maiden)
3's and 7's (by Queens of the Stone Age)
Suck My Kiss (by Red Hot Chili Peppers)
Raining Blood (by Slayer)
Reptillia (by The Strokes)
Paranoid (as made famous by Black Sabbath)
Cities on Flame (as made famous by Blue Oyster Cult)
Mississippi Queen (as made famous by Mountain)
La Grange (as made famous by ZZ Top)
These join the list of the other previously released tracks, which are:
Barracuda – (as made famous by Heart)
Cherub Rock – (by The Smashing Pumpkins)
Cult of Personality – (by Living Colour)
Even Flow – (by Pearl Jam)
Knights of Cydonia – (by Muse)
Lay Down – (by Priestess)
The Metal – (by Tenacious D)
My Name Is Jonas – (by Weezer)
One – (by Metallica)
Paint It, Black – (by The Rolling Stones)
Rock and Roll All Nite – (as made famous by Kiss)
Rock You Like a Hurricane – (as made famous by The Scorpions)
Sabotage – (by The Beastie Boys)
School's Out – (as made famous by Alice Cooper)
She Builds Quick Machines – (by Velvet Revolver)
Slow Ride – (as made famous by Foghat)
Welcome to the Jungle – (by Guns N' Roses)

Source: http://ps3.themanroom.com/news.php?id=1548