Together as JEFF the Brotherhood since 2002, Jake and Jamin Orrall are brothers from Tennessee who use guitars, drums and a whole lot of distortion to make a psychedelic-grunge-punk sound that rocks hard. Songs like “I’m a Freak” are heavy, hard rock reminiscent of the early 1970s, while “Bone Jamm” and “The Tropics” are more akin to surf-garage rock with a reverberatingly bouncy, noise-pop sheen. Maybe that’s why their upcoming tour for “We Are the Champions,” their sixth full-length album, includes shows with Heavy Cream, Black Lips, Vivian Girls and Fergus and Geronimo, to name a few. They claim on their MySpace profile that the sound in Saturday’s opener, Diarrhea Planet, is “Dub/Rap/Reggaeton,” but they are similarly hard-rocking with a more punk, guitar-laden sound. Whether you’re in the mood to mosh or to just bounce along to the beat, Saturday’s (free!) show will guarantee a great time.