"What a Mouth (What a North and South)" is a music hall song written by R. P. Weston in 1906 and first sung by Harry Champion.

[1] It is better known for the version recorded by Tommy Steele in 1960, which peaked at number 5 on the UK Singles Chart.

The song was often performed by Harry Champion, and was published as sheet music by Francis, Day & Hunter in 1906 as one of Francis & Day's Album of Cockney Songs.

[3][4] Steele recorded a cover of "What a Mouth" as it was one of his father's favourite songs.

[6][5] As with the rest of the album Get Happy with Tommy, "What a Mouth" was recorded live at Decca Studios.