Mainstream trends:
1980 - 1989 - Post Punk, New Romantic, Hip Hop and (Acid) House.
1989 - 1998 - Acid House to Big Beat, Acid Jazz and Britpop
2011 - 2020 - Overproduced shite featuring David Guetta to overproduced shite featuring David Guetta
6 Music has just informed me Closer by Joy Division is 40 today. My word.
Just played "Decades" and it doesn't sound 40 years old to me. Maybe that's because I'm an old fart that thinks that most modern popular music is overproduced shite (though there is still good stuff, you just have to know...