Beatles started out doing “skiffle” music, but had the talent and gumption to create their distinctive sound and compositions...from cover songs to bubble gum sweet songs, to cynical songs, and them psychedelia, and then undefinable tunes.
My fave albums..fwiw...Rubber Soul, Revolver, Sgt Pepper..all the others are very good ...and there are lots of little gems on different albums also.
When compared to most modern acts it is unbelievable how the Beatles music is so varied....
Beatles started out doing “skiffle” music
Speaking of Skiffle
A young Jimmy Page doing Skiffle
https://www.youtube.com/watch?v=ewNLaBhPRY8