Dirty Projectors are the rotating-cast project of Dave Longstreth, a prodigious guitarist, acrobatic singer, and adventurous composer. Longstreth's guitar playing is something like Deerhoof relaxing into a Malian safari; his singing is an ideal, airy falsetto; his compositions are difficult to explain but easy to appreciate. Dirty Projectors' latest album, Bitte Orca (the follow-up to the deservedly lauded Black Flag reinventions of Rise Above), includes his stunning collaborators Amber Coffman and Angel Deradoorian, whose voices are like so many butterflies fluttering in Longstreth's nets. (Chop Suey, 1325 E Madison St, 324-8000. 8 pm, $12, 21+.)