"Well, there's a credibility issue there," Roth tells Billboard following the group's appearance at the 2015 Billboard Music Awards in Las Vegas on Sunday. "Good, bad or in the middle, you know Roth means it; the other guy doesn't. And that's why it sold half as well. Literally, Midas Bible half. Never did better than half. And why would you bring that into the proceedings? This hamburger don't need no helper. Ain't no rehearsing pants in my closet."

Hagar joined Van Halen in 1985 as the band's second choice to fill the lead singer spot vacated by Roth that same year; Patty Smyth of Scandal was offered the gig before Eddie Van Halen approached the former Montrose frontman for the role.