Resident DJ Mark Chittom calls thirtyninehotel's new Double Joy night "unclassic disco." "It's a loosely programmed event based on left-of-center dance music from the '60s to the present," he explains. To that end, San Francisco's DJ Garth, right, who also owns Grayhound Recordings, spreads some happiness at this week's party. Get ready to have your brain recalibrated, because Garth challenges one's assumptions about what "dance music" means — but never sacrifices the groove, of course.

Double Joy Disco: 10 p.m.-2 a.m. Saturday; $12; 599-2552; www.thirtyninehotel.com.