AC / DC are an Australian hard rock band formed in Sydney, New South Wales. The group was founded in 1973 by brothers Malcolm and Angus Young.

The group grew quickly and they recorded their debut album, High Voltage, in September 1974. The album was a success and the Young brothers began performing in that year. Many groups have followed since AC / DC but the group is still a huge success with their last album.

Since the 1980s, the group has been recognized as one of the most important bands in heavy metal history. AC / DC became known for their very energetic and intimidating stage performances in the schoolyard. The group has sold more than 200 million records worldwide, including 71 million albums in the United States alone. AC / DC placed fourth on VH1's "100 Greatest Hard Rock Artists" list and was named seventh "Greatest Heavy Metal Band of All Time" by MTV.

They are often considered one of the earliest "Hard Rock" groups in history and are credited with creating what is now known as the "Hard Rock" sound. Their first album, "High Voltage", was released in 1974 and spawned three Billboard Hot singles.

With "Back in Black", the album will be certified diamond (with sales of over 10 million units) by the RIAA. They released their second album, "Alive in Australia", in 1975, which was also certified gold and spawned three ranked singles.