AC/DC is an Australian rock band formed in Sydney, New South Wales, Australia in December 1973 by Angus and Malcolm Young. AC/DC have sold more than 200 million records worldwide, including 71.5 million albums in the United States, making them the 10th highest-selling artist in the United States and the 14th best selling artist worldwide. Their 1980 album Back In Black has sold an estimated 50 million units worldwide, making it the third highest-selling album by any artist, and the highest-selling album by any band.