The Beatles were from the north of England. George Orwell in The Road to Wigan Pier describes every northern voice as sounding like a music hall comedian.

Perhaps because george formby and Gracie Field were Northerners - that's how northern accents sound to Eton educated southerners like George Orwell.

The legend is that The Beatles Sergeant Pepper was inspired by a music hall poster.

There exists a popular TV series called Goodbye Sweetheart where the protagonist hero has a time machine and sells When I'm 64 (a track from Sergeant Pepper album) to George Formby. Most middle aged English people can spot that music hall influence - jaunty chruses/ pathos/ northern accent - Sergeat pepper is great pastiche of all that.

Compare and contrast the English music hall classic My Old Dutch - performed against a painted backdrop of the poorhouse/workhouse. The pathos is beacuse the husband is old and having to go into the poorhouse, where he will be segregated fron his dear wife - who will go into the women's section - they will be parted.

In the Beatles song She's Leaving Home - its about parents whoare about to be parted from their daughter, who has run away from her stern forbidding home. Pathos again.

From about 1880, American acts were very popular on the English music hall. When that jazzy/cakewalk rhythm gets into English song - that's really the end of traditional rural English folksong.

Hope some of that's useful. Just my thoughts out the top of my head.