Who are the female backup singers to Joe Cocker's The Letter?

The female backup singers on Joe Cocker's version of "The Letter" are part of his band during that era, which included notable vocalists like Claudia Lennear and Rita Coolidge. Their harmonies contributed significantly to the soulful and dynamic sound of Cocker's rendition. The song showcases the blend of Cocker's powerful vocals with the rich backing harmonies.