It has been (literally) proven that the Beatles are the perfect band to use when learning to play guitar. I certainly can attest to this. Start out with songs with only 3 or 4 chords like Let it Be, or Love Me Do and work your way up to more complicated stuff like Blackbird, Here Comes the Sun, or Helter Skelter.

The Beatles were also learning their instruments as their career progressed, so it's perfect to learn new techniques along with them.