DIARRHEA PLANET There's a scene near the end of Mike Judge's fantastically funny (and oddly prophetic) film Idiocracy featuring a "guitarmy" - literally, hundreds of dudes playing power chords. Diarrhea Planet runs with the same gag, with four of its six members packing the instrument; gimmick or not, it works. The Nashville pop-rockers' shout-along-and-grin anthems are reminiscent of Weezer's Green Album as reimagined by the Four Loko crowd - or maybe this is what '90s college radio would sound like through an Adult Swim Dadaist filter. It would seem, then, it's no insult to compare Diarrhea Planet and Idiocracy's guitarmy: After all, both draw on the undeniable - and utterly absurd - joy and physicality of a cranked electric guitar... or four. Performing at Terrence & Phillip's 5th Annual Birthday Show with Junior Astronomers, Little Bull Lee and Old Soles. Free. Oct. 25, 9 p.m. Tremont Music Hall, 400 W. Tremont Ave. 704-343-9494.