"With a Smile and a Song" is a popular song.
The music was written by Frank Churchill, the lyrics by Larry Morey. The song was published in 1937. Credit is also sometimes (e. g.) given to Leigh Harline.
The song was sung by Adriana Caselotti in the Walt Disney animated film Snow White and the Seven Dwarfs.' It also featured in the stage adaption from the film.
The song was recorded by Doris Day with a children's choir for her 1964 album of the same name, With a Smile and a Song. A spoof of the song was used in Shrek the Third.
Snow White (played by Ginnifer Goodwin) hums the song while sweeping the dwarfs' house in the "Heart of Darkness" episode of Once Upon a Time.
References
With a Smile and a Song (song) Wikipedia(Text) CC BY-SA