The idea of "covering" hit songs, other artists quickly recording their own versions when the song was hot and popular, was nothing new from the 1920's to the 1960's. It resulted in multiple versions of some songs sitting on the pop or country charts at the same time. In other cases, the songs would be recorded by artists in other genres, Time might would pass before these versions were recorded and released. The practice eventually faded as the nature of pop music changed, unless the songs were interpreted in a completely different way (like easy listening or orchestral versions of Beatles songs).
Yesterday marked Dean Martin's 100th Birthday. Immortal because of his own work with Jerry Lewis, alone and as part of the Rat Pack with Frank Sinatra and Sammy Davis, Jr., his recorded legacy is vast and varied. It also has a couple of curiosities in it. One involves his best known song, "Everybody Loves Somebody."