MUSHROOMHEAD Formed in 1993, critics have usually lumped the mask-wearing metal band in with Slipknot. Fans of each band would argue that the other is copying their style, while Kiss sits off in a corner laughing at both of them. While I don't think they're going to win any singing competitions, the band does offer up some decent energetic metal with a melodic twist on occasion. Better bring earplugs, though. There are a ton of "special guests" on the bill, as well. $15/$18, Tremont Music Hall, www.tremontmusichall.com (Jeff Hahne)