Just explained here:
The visual representation is valid for ALL multi-value fields like ARTIST, ALBUMARTIST, COMPOSER, GENRE and so on...
You can't replace the non-existing \\ but merge them as @ohrenkino explained. With all advantages and disadvantages.
Please check carefully, if your player and software really can handle a COMPOSER with the single name “Solomon Burke, Aretha Franklin, Andre Williams, Bert Berns, Jerry Wexler, Verlie Rice, Otis Hayes, Ted White”