After spending two hours (8 – 10 p.m.) with Bonnie Simmons and Derk Richardson during the KPFA summer fund drive, stayed tuned for live music from the studio. Ann Dyer leads a portion of her 108-person choir of “everyday voices” in a preview of the Sept. 20-21 YBCA world premiere of VAK: Song of Becoming. Then, in a change of pace, singer-songwriter Michael Koppy shares a few songs from his ambitious Ashmore’s Store album.