AC/DC list of members that were part of the band before 1975, see List of AC/DC band members. AC/DC 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; the group have defined themselves as "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". In February
Malcolm Young band. Stevie Young continued to fill in for Malcolm on the band's 2015 Rock or Bust World Tour. On 26 September 2014, "The Sydney Morning Herald" reported that Young had been diagnosed with dementia and had been admitted to a nursing home where he could receive full-time care. A source close to Young was quoted in this article as saying that he had "complete loss of short-term memory". Young's family confirmed four days later that he had dementia, saying that Young "is suffering from dementia and the family thanks you for respecting their privacy". In subsequent interviews, Angus stated that