Pop music marked by three revolutions in 50 years
The evolution of western pop music, spanning from 1960 to 2010, has been analysed by scientists. A team from Queen Mary University of London and Imperial College London looked at more than 17,000 songs from the US Billboard Hot 100. They found three music revolutions - in 1964, 1983 and 1991 - and traced the loss of blues chords from the charts, as well as the birth of disco.
What would you include in your version of pop history?
Caspar Llewellyn Smith: In the first of a seven-part series about the history of modern music Guardian and Observer writers have picked out what they think are the 50 key moments in the story of pop. But we want to hear from you about who and what else we might have chosen