Fans of big band jazz have three reasons to celebrate: The first two are the double-CD Hiding Out, which marks the return of Mike Holober as composer, arranger, and pianist with the Gotham Jazz Orchestra after a 10-year hiatus. The third is the big band premiere of composer/saxophonist/flutist Remy Le Boeuf on Assembly of Shadows. Both projects offer subtle, sophisticated, and superlative feasts of symphonic jazz.