I had a friend in high school who was a huge Beatles and Rolling Stones fan. Although he loved both bands' music, he said for some reason the Beatles were much more interesting to read about than the Rolling Stones. I've read more than two dozen books about the Beatles, and it is true that they are an evergreen topic (FWIW I've never finished an entire book about the Stones). Even though I rarely listen to them anymore, I still enjoy reading the occasional book about them.
With that in mind, I picked up this slim compilation of post-breakup interviews at Barnes & Noble in Madison, WI three weeks ago for $3 used (only the second B&N I've seen with used books). There are interviews with Paul and George, as well as Yoko Ono, Linda McCartney, Julian Lennon, George Martin, and others close to the band. There are also short interviews with musicians influenced by the Beatles including Don Henley, Lenny Kravitz, David Bowie, and Heart.
For some reason the authors did not include interview dates, which would have been helpful. I wish some interviews had been longer, but on the other hand, they were short enough that I was willing to read even those with people who don't interest me. The book also could have focused more on the Beatles and less on their solo careers, but I know it's hard to get artists to talk about the past when they are much more interested in discussing and promoting their current work.
Note: My book looked nothing like this: