The legends of jazz knew if they wanted the best, they’d have to cross the Hudson from New York City to Hackensack. Rudy Van Gelder [1924-2016] was a sound scientist. Coltrane, Monk, Miles, Ellington, Ray Charles, Sonny Rollins, they all made the trip. The studio is in Englewood now, run by Maureen and Don Sickler. And it’s still producing gems.