Thunderstruck

Angus Young described the origin in the liner notes of the 2003 reissue of The Razors Edge. It began as a little trick on guitar, which he played to Malcolm, who said he had a rhythm idea that would sit well behind it. They fiddled with the song for a few months before it came together. For the lyric they needed a title, and settled on a thunder idea based on their favorite childhood toy, ThunderStreak. His summary was that AC/DC means power. In a 1993 interview with Guitar World, Angus said he had come up with the riff almost by accident while fiddling with his left hand. The riff alternates fretted notes with an open string.

Released in September 1990 as the lead single from The Razors Edge, it reached number 4 on the ARIA singles chart, number 1 in Finland, number 5 on the Billboard Album Rock Tracks chart and number 13 in the UK. Chris Slade played drums. David Mallet directed the video, which was filmed at Brixton Academy in London on 17 August 1990. Audience members were given free T-shirts saying "I was Thunderstruck", and everyone wore them during the shoot.

Michael Hann of The Guardian ranked it number eight on his 2020 list of the band's 40 greatest songs. Brian Johnson told him in 2014 that Angus has to practice the opening two or three times a day before going on stage. Of the 2,183 logged setlists that list songs, 804 include it, the earliest being the Brixton Academy show on 17 August 1990.