All the best to brave Ringo - Ritchie, the glue that kept the Beatles together.
Pete Best, Andy White and Jimmie Nicol should not be forgotten either for their stints in the Beatles hot seat.
I can thoroughly recommend
"One Two Three Four: The Beatles in Time by Craig Brown.
It’s a compelling read and possibly the best single volume book on the ’Fab Four’. Very British and no doubt much enhanced by hindsight.