MAINE VOCALS | It’s difficult to overstate the popularity of stompy nu-metal band DEAD SEASON in the provincial parts of Maine. Relatively speaking, they’re huge. And in lieu of formal descriptors of their music, one could point to their latest T-shirt design, a white-on-black number that features their logo on either side of an AR-15, with the cryptic message ARM THE GOOD PEOPLE written on the back. They play a semi-rare Portland gig with other groups along the hard-rock spectrum, KAMIKAZE ANGEL and SILENT SEASON. 8 pm at Mathew’s, 133 Free St. 207.253.1812.