M.O.D./S.O.D. frontman Billy Milano joined LAMB OF GOD on stage at the American Airlines Arena in Dallas, Texas on September 29, 2009 to perform a version of the S.O.D. classic "United Forces". Watch fan-filmed video footage of this unique one-time collaboration below.Commented LAMB OF GOD drummer Chris Adler: "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." Stated Billy Milano: "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."