Billy Mayhew, whose full name was William P. Mayhew, was an American songwriter best known for his popular 1936 song "It's a Sin to Tell a Lie." This song was introduced by many dance bands and later popularized by Fats Waller. Throughout the years, "It's a Sin to Tell a Lie" has been covered by numerous artists, including Somethin' Smith and the Redheads, Slim Whitman, John Denver, and Tony Bennett, among others. Mayhew's work spans the genres of vocal and jazz music, and his compositions have been featured in various albums and collections by artists like Billie Holiday, Vera Lynn, and The Ink Spots. Despite the widespread influence of his song, detailed biographical information about Billy Mayhew's life and career beyond his songwriting contributions is limited.