First evolutionary history of 50 years of music charts using big data analysis of sounds has been revealed.
The researchers studied trends in style, the diversity of the charts and the timing of musical revolutions and found that, contrary to popular belief, the so-called "British Invasion" of US pop music by groups such as The Beatles and The Rolling Stones, did not start a rock revolution, but only followed existing trends. The greatest musical revolution in US pop history was also not 1964, but 1991when hip-hop arrived in the charts.
The study found that 1986 was the least diverse year for the charts, a fact the researchers attribute to the sudden popularisation of drum machines and samplers at the time. Diversity recovered after that, and while it was declining again by 2010 the scientists reject pessimistic views of chart diversity: there is no evidence for a general trend towards homogenisation in the charts.
The researchers from Queen Mary University of London and Imperial College London, with help from music website Last.fm, used cutting edge methods from signal processing and text-mining to analyse the musical properties of songs.
Their system automatically grouped the thousands of songs by patterns of chord changes and tone allowing researchers to statistically identify trends with an unprecedented degree of consistency.
Lead author Matthias Mauch said that for the first time they can measure musical properties in recordings on a large scale. They can actually go beyond what music experts tell people by looking directly into the songs, measuring their makeup, and understanding how they have changed.
Mauch added that no doubt some will disagree with the scientific approach and think it's too limited for such an emotional subject but they can add to the wonder of music by learning more about it. They want to analyse more music from more periods in more countries and build a comprehensive picture of how music evolves.
The study appears in Royal Society Open Science.