Australian country music has developed a style quite distinct from its American counterpart, drawing more on Celtic folk and the Australian bush ballad tradition. Pioneers of popular Australian country music include Tex Morton in the 1930s and Smoky Dawson from the 1940s onward. Known as the "King of Australian Country Music", Slim Dusty released over 100 albums in a career spanning almost six decades; his 1957 hit "A Pub With No Beer" was the first Australian single to go gold. Dusty's wife Joy McKean penned several of his most popular songs. Other notable Australian country music performers include John Williamson who wrote the iconic song "True Blue", Lee Kernaghan, Adam Brand and Kasey Chambers. Olivia Newton-John and Keith Urban have attained success in the United States. The Tamworth Country Music Festival is held annually in Tamworth, the "Country Music Capital of Australia". During the festival the Country Music Association of Australia holds the Country Music Awards of Australia ceremony awarding the Golden Guitar trophies.