How cool would this be to see? You're at an Anthrax show and then Kirk Hammett of Metallica joins them on stage!

Anthrax is celebrating their recent album release entitled "Worship Music." The album sold 28,000 copies in it's first week which is good enough for 12 on the Top 200 Billboard Music chart.

The performance took place at The Warfield in San Francisco, Ca. Check out the performance and keep wishing you were at this show!