The Beatles are great.
We don't even want to talk about this. It's a given, and the contrarians that disagree are the same people that argue that milk actually doesn't go that well with cereal and that it's more comfortable if you wear shirts as pants. If someone argues with you about the Beatles not being a good band, don't even get into it. Just make a noise, like "pshhh" or "uhhfffph" or "dtehhha."