Czech double bass virtuoso and composer Miroslav Vitous must by now have shrugged off any residual irritation about the oft-circulated fact that he was a founding member of the legendary jazz-rock fusion band Weather Report in 1970. Vitous’s dislike of the band’s drift away from improv toward electric music and popular global funk saw him leave as their star was rising. His CV would turn out just fine: Miles Davis, Chick Corea, Jan Garbarek, John Surman and Jack DeJohnette were among his many classy playing partners. Seven years in the making, with Vitous now 78, Mountain Call reflects a lifetime’s immersion in classical music alongside jazz, and the balance of spontaneity, nuance and cinematic atmospherics that offered him. The artwork for Mountain Call Across multiple improv dialogues and two suites (all short, Vitous being no fan of loquacity), the set prominently features DeJohnette, who died in October, with Esperanza Spalding, saxophonist Bob Mintzer and the phenomenal French clarinettist Michel Portal, who died in February. Eight duo tracks for Vitous and Portal (mostly all-improvised) are worth …