Sons of the Pioneers -- Ghost Riders In the Sky

Stolen entire from Borepatch:

The Queen Of The World pointed out to me that Ken Curtis (who played Festus on Gunsmoke) was also a professional singer.  In fact, he had a long career doing that: he was lead singer for the Tommy Dorsey Orchestra, replacing Frank Sinatra in 1942.  But he was most famous as front man for Sons Of The Pioneers.  This is him singing in 1949.

Festus replaced Frank Sinatra?!? Hidden talents where least expected.