Well, I was talking about Helter shelter but there is I Want You (She's So Heavy) too. The riff, the structure and the tone of the voice in Helter Shelter remind the early metal, and the end in I Want you is pretty standar for the genre. But you can discuss that and I won't blame you, there is a full argument about that.
All good musicians also take all the inspiration for somewhere, they just give it a different approach, and yes I'm pretty sure that without the influence of american music after and during the length of the band it wouldn't be "The Beatles", and that was the circunstances that made them great, because they were great at some points.
They had the opportunity to push the rock limits. I didn't mean that they influenced AC/DC or Rainbow, just that the form that they played music reach places that no one before had reached.
RE: Beyond the Beatles: a bit of good music from the 60's