The always-rousing Rova Saxophone Quartet is augmented by guitar luminaries Nels Cline and Fred Frith and other guest artists for a brilliant new interpretation of John Coltrane's Ascension--the monumental 1965 piece that stands as one of the key watersheds of post-bop free jazz. In addition to Rova's four reeds--played by Bruce Ackley, Steve Adams, Larry Ochs and Jon Raskin--the 11-piece ensemble features the violins, electric guitars, drums and an array of electronics, samplers and turntables of guests Jeff Gauthier, Earl Harvin, Ronit Kirchman, Tom Recchion and Mark Trayle. The two performances at REDCAT mark the 40th anniversary of Coltrane's contribution to the emergence of structured improvisation.