It's a somewhat well know factoid that the Beatles wanted to star in an adaptation of Lord of the Rings. It's also a somewhat well known factoid that Stanley Kubrick was approached about an adaptation of Lord of the Rings. Kubrick thought the project was unfilmable, and the real death knell was that Tolkien refused to allow a film with the Beatles starring.
To quote Peter Jackson
To quote Peter Jackson
That is a hurdle that is hard to overcome, but there is an alternative which inspired this: What if, rather than seeking to star in the film themselves, the Beatles had simply sought to use the film division of Apple to produce an adaptation? It'd be other actors, perhaps someone besides Kubrick, but approaching Tolkien with the offer that Apple films would like to get behind the production of a Lord of the Rings film.“It was something John was driving, and J. R. R. Tolkien still had the film rights at that stage, but he didn’t like the idea of the Beatles doing it. So he killed it”.