Dont know anything about metal? Dont particularly like metal, but want something a little heavier in your musical diet? Check out the roster of Hydra Head Industries, where the bands are a sure bet for satisfying your more persistent dark moods, even if they arent all metal-by-definition (hello, Pelican!). What is the definition, anyway? Merriam-Webster provides energetic and highly amplified electronic rock music having a hard beat (hoo boy, I cant wait to see what they do with crunk, which got the nod for this falls edition), but All Music Guide reads, of all rock and rolls myriad forms, heavy metal is the most extreme in terms of volume, machismo, and theatricality. Also not so accurate in 2007. So many music fans have come to trust Hydra as a quality-stamp that the label now releases, alongside bona-fide metal and math heavy-hitters ISIS and Botch, the veiled shoegaze of Jesu and the sludgy but completely indie-rockin Pelican. The Chicago bands latest, City of Echoes, could be their best. Its got all the ingredientsOK, a little bit of theatricality and a lot of volume, if not machismofor those waking dreams a really good rock show can propel you into. With Clouds and Gargantula.