How much progress had Van Halen made on their seventh studio album before parting ways with David Lee Roth in 1985, and how much of that work made its way onto 5150, the band’s first album with ...

But with 1986's '5150' Van Halen proved they knew what they were doing when they hired Sammy Hagar, even if the result was a markedly different, more mature version of everybody's favorite party band.