I saw nearly all the groups listed in this thread at the Alan Freed R&R shows at the Brooklyn (NY) Paramount in the Fifties. Freed was generous with fans: he always had them do encores, and told the groups to come out at the stage entrance after his shows to shake hands and greet the fans. I met a lot of the members of those groups after the shows when they came out at the stage entrance. I also saw--and met after the shows--Buddy Holly, Bo Diddley, Chuck Berry, Little Richard, Fats Domino and Jerry Lee Lewis.