That's quite the list. though I do not consider some, like Sinatra to be Rock & Roll.
An essential question has not been asked: "Top" at what? Earning money? Most influential? Most appealing music?
The station is calle "Real Oldies" so they play a lot of popular stuff from Perry, Nat, Dean, Tony Bennett, Johnny Mathis, etc. all of whom should probably be on the list as well.