He began his stage career aged 14 with the group Park Eton's Boys. In 1913 he appeared in the revue Hello Tango.
Sarony became well known in the 1920s and 1930s as a variety artist and radio performer.
He went on to make a number of recordings of novelty songs, such as "He Played his Ukulele as the Ship Went Down", including several with Jack Hylton and his Orchestra.
He also wrote Tom thumb's drum and recorded it with the Orchestra directed by Jack Hylton.
Jack Hylton Orchestra & Leslie Sarony - Tom thumb's drum