AC/DC are an Australian rock band, formed in Sydney in 1973 by brothers Malcolm and Angus Young. Their music has been described by music journalists as hard rock, blues rock, and controversially, heavy metal, although the group have called themselves “a rock and roll band, nothing more, nothing less”. AC/DC underwent several line-up changes before releasing their first album, High Voltage, in 1975. Membership subsequently stabilised until Cliff Williams replaced Mark Evans as bassist 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 considered disbanding, but buoyed by support from Scott's parents, decided to continue and set about finding a new vocalist. The band eventually tapped Geordie singer Brian Johnson to replace Scott. Later that year, the band released their new album Back in Black, which they dedicated to Scott's memory. The album launched them to new heights of success and became their all-time best-seller.