Will:
I suspect you're a little younger than I am. I never saw the so-called 'British Invasion' as any more than UK groups, after plagiarizing American roots music and early rock-and-roll, simply selling it back to America.
My first influences were undoubtedly American: once I'd heard Little Richard, Don & Phil, the young Elvis and Jerry Lee, anything home-grown was decidedly lackluster. The only exception was Britain's Lonnie Donegan (huge from '56 to '61) and even he was adapting blues, Woody Guthrie songs and US roots music. The Beatles themselves began by being a cover-band (their first couple of albums are half filled with non-originals); of course, they went on to be very creative (even if only average players) but I'm smart enough to know that's not how they're viewed over here.
A quick tale: in 1964, we (Eden Kane & the Downbeats - not a name in the US but we had some big UK hits), the Beatles and Jerry Lee Lewis were booked to record a BBC radio session. They used an old theatre down by the Thames and it was a rainy Wednesday morning. We did our three tunes first, the Beatles waited for us to finish, then did their three (this was 1964, and they were already taking the world over, much to the detriment of Eden Kane, my boss).
None of us left the theatre, even when our bit was done. We ALL wanted to see a real American rocker - Jerry Lee! He was curt, abrasive and bordered on the rude but we and the Fab Four sat and watched every note he played. So, as big as they had become, the Beatles still revered those who'd really started the music in the mid-fifties, as did I.
Maybe Lonnie Donegan can take half the credit for starting us all off getting guitars. The rest goes to the American boom in rock.
I'm 80, and that's my perspective. If you, Will, were a young teenager when the Beatles came on the Ed Sullivan Show, then it's understandable that you'd see that as your musical 'coming of age'. Mine came with 'Wake Up, Little Susie'!!!
Elton singing 'He'll Have to Go': it was very good. He altered the end and played a coda going to the 3/7, 6/m, 2/maj. As I accompanied him (just his piano - the cast hastily assembled an off-the-cuff backup vocal - and my steel) I could hear where he was going with that outro and I followed okay.
Somewhere here, there's a DVD of that night. If I were a 10-year old, I could download it to YouTube in an instant. As it is, I wouldn't know where to start.
Maybe one day.