Pioneer days open tenor; biggest US record seller before 1920. Song introduced by Georgie Price (and Nora Bayes) in revue Ziegfeld Follies of 1909.
Clark Gable [in film Idiot's Delight]
Bing Crosby [in film Birth Of The Blues]
Doris Day & Gordon MacRae [in film of that name]
Little Richard [see: Baby Face]