Revolution In The Head
Ian MacDonald's Revolution in the Head: The Beatles Records and the Sixties is, quite simply, the best book ever published about the Beatles and their music. Its first half is the best description of the '60s I've ever read; its second half is a track by track exploration of the songs and the process of recording them. It's out of print in the USA, but there's a new edition available in the UK and it can be ordered from the link. Do yourself a favor and read this book if the Beatles mean anything to you at all.
MacDonald writes like an angel and his passion shines through in every line. Forget love, all you need is this book.