The evolution of western pop music 西方流行樂壇過去50年的發展
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The researchers say the first pop revolution happened in 1964, with British fans from The Beatles to The Who bringing a radical change of sound.
They came to this conclusion after analysing the harmonies, chords and tones of songs that appeared in the US charts between 1960 and 2000.
New technology, synth-samplers and drum machines, drove a second major style-shift in 1983, while the third started in the early 90s when hip-hop and rap went mainstream.
The researchers found that music continues to evolve and change, apart from in the 1980s when the dominance of arena rock kept everything sounding the same.