The Louvin Brothers were an American country music duo composed of brothers Ira Lonnie Loudermilk (1924–1965) and Charlie Elzer Loudermilk (1927–2011), better known as Ira and Charlie Louvin. They helped popularize close harmony, a genre of country music. The brothers are cousins to John D. Loudermilk, a Nashville Songwriters Hall of Fame member. The brothers adopted the name Louvin Brothers in the 1940s as they began their career in gospel music.