Metallica's 30th anniversary celebration is all over, but not before they rocked The Fillmore and jammed with several celebrity guests. 

Geezer Butler and Ozzy Osbourne were on hand to help Metallica celebrate three decades together. Geezer said performing with them was a ""pleasure and honour". He helped out on Paranoid and Sabbra Cadabra/A National Arobat. Ozzy also sat in on Iron Man.

Geezer took to his blog to talk about the gig calling Metallica, "great bunch of guys, and of course one of the world's greatest bands." He continued on by saying that they did their fan club proud and even referred to their late bassist Cliff Burton by saying that he was "definitely in the house with us, and smiling"

So, what's next for Metallica and Black Sabbath? Well, Metallica is hitting the road in 2012 to play their Black Album in its entirety and Black Sabbath is heading back to the studio to do a 40th anniversary album and are looking at doing a tour.