It wasn't just Guy Mitchell that was "Singing The Blues" like he didn't have a care in the world. Marty Robbin's version had a different instrument arrangement but was also just as jolly (and almost a note by note copy).

It seems that back in the fifties and early sixties it was not uncommon for different artists to share popular songs and arrangements. Guy had his audience while Marty had his so both versions could be popular and receive radio airplay without worrying about one version pushing the other out of the way.

I never heard the Patti Page version of "How Much Is That Doggie In The Window" until many years after it was released because the radio station my parents listened to only played the version by Homer & Jethro.

Never read of a songwriter complain about multiple performaces of a song.

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