M.O.D./S.O.D/Mastery frontman Billy Milano recently Joined Lamb Of God on stage at the American Airlines Arena in Dallas, TX.

After being introduced by Randy Blythe, the Lamb Of God and Billy Milano ripped through the S.O.D. classic 'United Forces'.

Lamb Of God drummer Chris Adler had the following to say about the blistering performance: "We were honored to share the stage with a legend. Billy and S.O.D are our roots and I'll remember this moment forever."

Billy Milano also commented about the performance with the Lamb Of God Guys: "To share the stage with Lamb Of God was fucking amazing. It was a life changing experience. Watching the video on YouTube, I couldn't believe the size of the stage I was on. I don't want to say it was the highlight of my career, but it truly was a milestone. Words are escaping me while trying to describe this event, which is strange, since I never shut the fuck up."