Tonight, John Zorn's tiny venue the Stone hosts Mercury Rev for an experimental, improvisational performance, in which the psychedelic indie rockers collaborate with brainwave-feedback musician Alex Chechile and digital-art collective feedtank. It's a big month for Mercury Rev, who have two new albums coming out on September 29: Strange Attractor, a free, download-only album, and Snowflake Midnight, a conventional physical release. Tickets for the Stone are sold only at the door the night of the show, so show up early and don't forget to pre-party: Zorn's venue doesn't sell drinks or food.