Members of Def Leppard, Guns N' Roses, Skid Row and Deep Purple are performing together in Australia this weekend on a bill with Van Halen and Aerosmith. Now THAT'S a rock festival.

Yeah, they may have put a few years on, but together, they've sold MILLIONS and MILLIONS of albums worldwide. They're performing as the Kings of Chaos on the first ever Stone Music Festival in Sydney, Australia this weekend. The headliners for Saturday? Van Halen and Aerosmith!

And don't feel bad if you didn't recognize all the guys in this picture, but guessing you know the bands.

In front (l-r) Matt Sorum of Guns N Roses, The Cult and Velvet Revolver; and managing the band is former Extreme drummer Paul Geary.

Back row (l-r) Sebastian Bach of Skid Row; Duff McKagan of Guns N' Roses and Velvet Revolver; Joe Elliott of Def Leppard, Glenn Hughes of Deep Purple, Black Sabbath, Black Country Communion and others; and Gilby Clarke of Guns N' Roses.

We'll be on the lookout for some videos from Down Under. I've GOT to hear what they sound like!