Millions of fans, and not just baby boomers, stream Beatles songs on Spotify every month. Dozens of books examine their rise, their influence, and their appeal all these years later. You might think there's nothing left to know about the four working-class lads from Liverpool who became the most famous people in the world. Yet even the most hard-core Beatles fans are still amazed at what they don't know.Millions of fans, and not just baby boomers, stream Beatles songs on Spotify every month. Dozens of books examine their rise, their influence, and their appeal all these years later. You might think there's nothing left to know about the four working-class lads from Liverpool who became the most famous people in the world. Yet even the most hard-core Beatles fans are still amazed at what they don't know.