Tubeileh

So recently I've been getting into 60s-80s music, which includes a lot of British bands and musicians. So I wondered: why? And I got a few results, the biggest being "The British Invasion". However, people say it only was in the mid-60s, so that excludes all the later very prominent british music (Pink Floyd, The Clash, Led Zeppelin, etc.) So I was wondering why the british invasion was only considered the mid-60s, and why after the 60s the british still made such great music? or was it all a coincidence?