Clarence Paul Herfurth was the first author of the Tune a Day books, which are used across the English speaking world to teach music.
According to A Tune a Day: Trombone or Euphonium (1944), Herfurth was born in 1893, and "began violin lessons at the age of seven and studied in Germany for a year before entering the New England Conservatory of Music in 1911.
Although best known for his Tune a Day books, Herfurth also edited and arranged many collections for violin, cello and viola with piano.
This source explains that Herfurth later enlisted the services of Hugh M. Stuart and other writers to expand the coverage of the books.
Others quickly followed: Tune a Day for Cornet (Trumpet) Instruction (1941), titles for clarinet, string bass, trombone (baritone) and saxophone in 1942, 43, 44 and 45 respectively.