Earth & Helms Alee at Mid City Ballroom

Single notes held to portentous lengths—that should give a sense of drone doom, the genre proudly explored by Washington-based Earth, fronted by Dylan Carlson since 1989. Helms Alee, meanwhile, offers sludge metal—somewhat lighter fare, thanks to lyrics, but no less concerned with the emotional core of mankind. 8 pm. Dive to harrowing tonal depths with both groups at Mid City Ballroom tonight. $17. midcityballroom.com.