Further to the Gnome's contribution. but wildly off topic. Folk became popular as the changes below were occurring. It demonstrates that the popularity of musical genres rises and falls over time.

https://acousticmusic.org/research/history/musical-styles-and-venues-in-america/skiffle-in-britain/

Venues like Eel Pie Island to an extent show the transitions of genre

http://www.twickenham-museum.org.uk/detail.php?aid=208&cid=52&ctid=3
https://www.messynessychic.com/2014/08/21/the-tiny-island-on-the-thames-that-once-held-the-rolling-stones-david-bowie-and-the-uk

The list of acts on Eel Pie Island traces the evolution of jazz, blues, pop etc in terms of the acts booked and it is pretty comprehesive Donegan, Melly, the Stones, Brian May, Rod Stewert etc

https://www.eelpiemuseum.co.uk/rollcall/rollcall/

https://www.youtube.com/watch?v=UIK6s8HESYY