Alien Ant Farm enjoyed their biggest success in 2001 with their cover of Michael Jackson's 'Smooth Criminal.' The band just performed it at the 'Michael Forever' tribute concert over the weekend, which was held in Cardiff, Wales, alongside stars like Cee Lo Green, Christina Aguilera, Smokey Robinson and more. The Southern California band performed two Michael Jackson songs: the aforementioned, chart-topping cover of 'Smooth Criminal' and 'PYT (Pretty Young Thing).'

Guitarist Terry Corso commented on the So Cal band's performance at the emotional event, saying, "I honestly think it would be extremely hard for me or any of my bandmates to really express how much of an honor it was for us to be included in the 'Michael Forever' concert in Wales. It was literally one of the most exciting and surreal moments of our careers. From hanging out with Cee Lo Green in our dressing room to passing Smokey Robinson in the hall, it was the stuff dreams are made of for guys like us who grew up in a diverse musical landscape."

Corso admitted that the fact that the band was invited to be included was touching, as well. He said, "We are very taken by the fact that the Jackson family would keep us in their minds and include us in this special opportunity to pay tribute to the King of Pop alongside so many people that loved him. MICHAEL FOREVER!"

Watch 'Smooth Criminal' From Alien Ant Farm

In other AAF news, the band will begin working on its fourth album in November. A spring 2012 release date is being eyed. It'll be the band's first release in a half-dozen years. 'Up in the Attic' landed back in 2006. The new album is special in that it will mark AAF's first release with their original lineup since 2003.