When you party with Dirty Horse, every weekend feels like Labor Day. Best paired with a Jucy Lucy and a cooler full of Shasta, this Duluth staple keeps the spirit of classic rock-and-roll alive. That’s not to say the band’s sound feels stuck in the past, however. Landing comfortably within the realm of contemporary music, the vintage influences act more as a backbone than the whole enchilada. As vocalist Nate Case and Andy Olmstead string together guitar harmonies that would make Dickey Betts proud, bassist Brian Wells and drummer Rio Daugherty complete the Horse’m Foursome with thunder and lightning.