AC/DC's power-chord roar is one of the most influential sounds in hard rock and as spawned countless imitators since. Formed in 1973 in Australia by guitarist Malcolm Young and his brother Angus as lead guitarist, the band played some gigs around Sydney. Angus was only 15-years-old at the time and his sister suggested that he wear his school uniform on-stage; the look became the band's visual trademark. The group released High Voltage and TNT in Australia in 1974 and 1975. Dirty Deeds Done Dirt Cheap followed. In 1977, AC/DC released Let There Be Rock, which became their first album to chart in the U.S. What really broke the doors down was 1979's Highway to Hell, which became the group's first million-seller. AC/DC's train derailed when lead singer Bon Scott died in 1980. The band soon replaced Scott with Brian Johnson and recorded Back in Black, which would prove to be their biggest album. After 1983's Flick of the Switch, the band's went dormant until 1990's The Razor's Edge, which spawned the hit "Thunderstruck" and maintained their status as a top concert draw. In 1995, Ballbreaker, entered the charts at number four. Stiff Upper Lip followed in 2000. The band's latest album, Black Ice, is their biggest hit since, For Those About to Rock, reaching No.1. As of 2010, AC/DC had sold more than 200 million albums worldwide. Back in Black has sold an estimated 50 million units worldwide, making it and the highest-selling album by any band ever.