 The song was most likely first recorded by Art Gillham (‘the Whispering Pianist’), who recorded ‘I'm Sitting on Top of the World’ on 24 October 1925.Al Jolson's recording was made on December 21, 1925.Jolson sang it in the 1928 part-talkie film "The Singing Fool" and in his biographical movie "The Jolson Story" in 1946.