Fantasy Records [now part of Concord Music Group] says that it holds "The World's Mightiest Jazz Catalog" and has been releasing a series of Original Jazz Classics samplers to support the claim. Three are based on '50s and '60s recordings that came out on smaller and subsidiary labels like Jazzland, New Jazz, Specialty, and HiFiJazz.  Those three are, to me, the most interesting so far. That's probably because most of the performances and even a number of the performers are less well known than the relatively big names and familiar performances that the earlier Fantasy, Prestige, Riverside, and Contemporary compilations quite naturally present.