David Lee Roth favored highly sexual lyrics etc. and Sammy Hagar was more into more serious "square" music. Well, David was essential to Van Halen's early music and even suggested the name for the band. On the other hand, would Van Halen ever right any music a bit deeper if not for the 2nd stint of the band? Of course, that's not saying the early Van Halen could not be deep at times.