William Martin Joel is an American singer, pianist, composer and songwriter. Commonly nicknamed the "Piano Man" after his single and signature song of the same name, he has led a commercially successful career as a solo artist since the 1970s, having released 12 pop and rock studio albums from 1971 to 1993 as well as one studio album of classical compositions in 2001. He is one of the best-selling music artists of all time, as well as the seventh-best-selling recording artist and the fourth-best-selling solo artist in the United States, with over 160 million records sold worldwide. His 1985 compilation album, Greatest Hits Vol. 1 & 2, is one of the best-selling albums in the United States.