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
Hard rock "Double Live Gonzo!" (1978). From outside the United Kingdom and the United States, the Canadian trio Rush released three distinctively hard rock albums in 1974–75 ("Rush", "Fly by Night" and "Caress of Steel") before moving toward a more progressive sound with the 1976 album "2112". The Irish band Thin Lizzy, which had formed in the late 1960s, made their most substantial commercial breakthrough in 1976 with the hard rock album "Jailbreak" and their worldwide hit "The Boys Are Back in Town", which reached number 8 in the UK and number 12 in the US. Their style, consisting of two duelling