Many of Robert Cray's physical releases are credited to "Robert Cray" in some places (usually on the front cover) and "The Robert Cray Band" in others (usually on the spine). If you're adding a new release group, check [artist:7112c4bc-5b15-4180-bfd5-2ca76745e87c|Robert Cray] first – it may already be there. See https://community.metabrainz.org/t/robert-cray-what-have-you-done/572358 for more discussion.