That’s not music! The common objection to experimental noise came to mind during separate performances of manic improvisations presented by the Extemporaneous Music Society at the Charlotte Street Foundation on Wednesday, October 20. Quadraphonic sound enhanced the maelstrom created by Jeff Kaiser (trumpet, electronics, gadgets), Kevin Cheli (drums, percussion) and Seth Davis (guitar). A dizzying racket spiraled around the audience of 25 from speakers in four corners of the room. Kaiser is a stupendously industrious trickster, so I didn’t mind the failure of Cheli and Davis to showcase material from their recently released album as a duo. My tolerance didn’t extend to the second set. Aaron Osborne (bass, percussion) made several interesting contributions to a collaboration with Benjamin Baker (saxophone) and Evan Verploegh (drums), but I’d hoped to hear the saxophonist and drummer present music from their outstanding new Singles album. Missed opportunities aside, the bold caterwauling was music to my ears.