C/DC are an Australian hard rock band, formed in November 1973 by brothers Malcolm and Angus Young, who have remained constant members. Commonly referred to as a hard rock or blues rock band, they are also considered pioneers of heavy metal and are sometimes classified as such, though they have always dubbed their music as simply "rock and roll". To date they are one of the highest-grossing bands of all time.
AC/DC underwent several line-up changes before releasing their first album, High Voltage, on 17 February 1975. Membership subsequently stabilised until bassist Mark Evans was replaced by Cliff Williams in 1977 for the album Powerage. Within months of recording the album Highway to Hell, lead singer and co-songwriter Bon Scott died on 19 February 1980 after a night of heavy alcohol consumption. The group briefly considered disbanding, but buoyed by support from Scott's parents, decided to continue and set about finding a new vocalist. Ex-Geordie singer Brian Johnson was auditioned and selected to replace Scott. Later that year, the band released the new album, Back in Black, which was made as a tribute to Bon Scott. The album launched them to new heights of success and became their all time best-seller.
The band's next album, For Those About to Rock We Salute You, was their first album to reach number one in the United States. AC/DC declined in popularity soon after drummer Phil Rudd was fired in 1983 and was replaced by future Dio drummer Simon Wright. The band experienced a resurgence in the early 1990s with the release of The Razors Edge. Phil Rudd returned in 1994 after Chris Slade, who was with the band from 1989–1994, was asked to leave in favour of him, and contributed to the band's 1995 album Ballbreaker. Since then, the band's line-up has remained the same. Stiff Upper Lip was released in 2000 and was well received by critics, and the band's latest studio album, Black Ice, was released on 20 October 2008 and was the second-highest-selling album of that year. It was their biggest hit on the charts since For Those About to Rock, eventually reaching No.1 on all charts worldwide.
As of 2010, AC/DC had sold more than 200 million albums worldwide, including 71 million albums in the United States alone. Back in Black has sold an estimated 50 million units worldwide, making it the second-highest-selling album by any artist – behind only Michael Jackson's Thriller – and the highest-selling album by any band. The album has sold 22 million units in the U.S. alone, where it is the sixth-highest-selling album of all time. AC/DC ranked fourth on VH1's list of the "100 Greatest Artists of Hard Rock" and were named the seventh "Greatest Heavy Metal Band of All Time" by MTV. In 2004, AC/DC were ranked number 72 in the Rolling Stone list of the "100 Greatest Artists of All Time". In 2010, AC/DC were ranked number 23 in the VH1 list of the "100 Greatest Artists of All Time".