Crown was the budget label of RPM/Modern. Most Crown LPs were pressed on very low grade vinyl. Modern/RPM/Crown went bankrupt, but the company was revived as Kent, with United as the budget label. There were some good quality recordings on RPM/Modern/Crown/Kent/United, but the sound quality for the most part wasn't heard until Ace in the U.K. started reissuing that material. The Bihari brothers, the original owners of the labels, skimped on masterings, pressings, covers, and anywhere they could save a buck. Ace has finally done things right.