The country star made a surprise appearance during Sammy Hagar's 'The Best of All Worlds' Las Vegas residency.

In Las Vegas, former Van Halen frontman Sammy Hagar wrapped up his Best of All Worlds residency this weekend, while country ...

Van Halen fired Hagar in 1996, after which the singer returned to making music under his own name and focused on his bars — ...

LOS ANGELES — Sammy Hagar has been one of rock music's most ... with guys in the country world than with most rock stars." Kenny Chesney, Ronnie Dunn, the late Toby Keith — Hagar counts ...

Sammy Hagar, seen performing during January's MusiCares Person of the Year gala, will appear at this weekend's Stagecoach festival in Indio. (Chris Pizzello / Invision / AP) ...