Two all-star quartets of Los Angeles improvisers celebrate their new CDs. The Present Quartet (Ellen Burr – flutes, Anne LeBaron – harp, Jeff Schwartz – bass, and Charles Sharp – reeds) have released “Routes, Paths, Courses” on Pfmentum, while cornetist Dan Clucas’ Boojum Quartet (with Vinny Golia – reeds, Steuart Liebig – electric bass, and Alex Cline – drums) have self-published their eponymous debut. These artists’ collective resumes are an encyclopedia of creative music, from Muhal Richard Abrams, Derek Bailey, Bobby Bradford, and Anthony Braxton through Satoko Fujii, Henry Grimes, Julius Hemphill, Peter Kowald, and onwards, with supplements for work in contemporary and traditional classical music, rock, Chinese, Korean, and Arabic music.