William Martin Joel is an American singer, songwriter, and pianist. Nicknamed the "Piano Man" after his signature 1973 song of the same name, Joel has had a successful career as a solo artist since the 1970s. From 1971 to 1993, he released 12 studio albums spanning the genres of pop and rock, and in 2001 released a one-off studio album of classical compositions. With over 160 million records sold worldwide, Joel is one of the world's best-selling music artists and is the fourth-best-selling solo artist in the United States. His 1985 compilation album, Greatest Hits – Volume I & Volume II, is one of the best-selling albums in the U.S.