AC/DC is an Australian rock band formed in Sydney, Australia in December 1973 by Angus and Malcom Young. Their albums have sold in colossal numbers; the total is now estimated at well over 150 million copies worldwide, with the 1980 album Back In Black selling over 21 million in the US alone and 40+ million worldwide. The band has had two distinctive lead singers, and fans tend to divide its history into the "Bon Scott era (1974-80)" and the "Brian Johnson era (1980-present)".

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