Bobby could be Bobby Sherman, Donny could be Donny Osmond, Nothing immediately comes to mind for Ron, Ron-Don, John, Lon and Melvin.
Yah, that's gotta be David Cassidy and Donny Osmond for sure. And either Bobby Sherman or Bobby Darin (although he died December 20, 1973... which is interesting). Lon's gotta be Lon Chaney Jr. (I would think). There's a "Ron Pearson And The Ron Dons" that was around in the late 60's, but it sounds like they were very obscure. Maybe Art or Jay or Norm were fans? And John Lennon would seem the most likely John for the times. Melvin, though? ...so far Donny's the only one that survived to Dec. 2020.
Man, we lost a TON of cool pop-culture characters in 2020... James West AND James Bond, Emma Peel AND Catherine Gale, Darth Vader AND BobaFett, Bilbo Baggins, Eddie Haskell, Mary-Anne, The Gambler, plus Alex Trebek AND Tom Kennedy, and a zillion other actors/actresses/musicians we all grew up with. I was shocked to see the full list today.