Sammy Hagar joined Kid Rock on stage in Detroit Friday night (Aug. 12) to perform a stomping cover of Grand Funk Railroad's 'We're An American Band' complete with new, self-referencing lyrics.

Hagar opened for Motown's favorite rapper/rocker/country singer at two shows in Comerica Park, home of Major League Baseball's Detroit Tigers, over the weekend.

Rock, a huge classic rock fan who's frequently performed with Bob Seger and regularly introduces his hit 'Cowboy' in concert with a snippet of the Allman Brothers' 'Midnight Rider,' brought the Red Rocker back up near the end of his headlining set to duet on the "life on the road" anthem.

As the cowbells and electric guitars raged in the background, Rock and Hagar felt no need to stick to the original verses, instead referencing Sammy's beloved tequila and, if we're hearing them right, Rock's fellow Detroit native Ted Nugent. "This is the man, right here, Detroit!" Sammy announced after the song while pointing at Rock, "This is a bad m----------!"

Hopefully soon we'll hear more news about Hagar heading out on the road again as part of Chickenfoot. The band are currently preparing to release their new album, 'Chickenfoot III' (Sept. 27), from which we've already heard the excellent first single 'Big Foot.'

Watch Sammy Hagar and Kid Rock Perform 'We're An American Band' in Detroit