According to Wikipedia;
Jerry Butler, Jr. (born December 8, 1939) is an American soul singer and songwriter. He is also noted as being the original lead singer of the R&B vocal group the Impressions, as well as a 1991 Rock and Roll Hall of Fame inductee.
Since there is no R&B hall of fame, one can only go to the Rock and Roll hall of fame; consequently the confusion; but being an "audiologist", I can discern by what it sounds like, that's what it is.