Billy Crudup's Russell Hammond from Almost Famous clearly owes his look to Dickey Betts, but is an amalgam of other 1970s rockers like Jimmy Page. I thought this was interesting from an interview today (the whole AV Club interview, which discusses many of Crudup's other roles, is at http://www.avclub.com/article/billy-crudup-wont-tell-us-which-movie-he-got-fired-253245 ):

AVC: What advice did Peter Frampton and Nancy Wilson give you about guitar playing?

BC: I can remember seeing some footage of The Allman Brothers Band, and thinking I wanted to play the guy like Duane Allman, and sort of sit there back in the shadows and just jam. I thought that suited [Russell’s] personality and would be an interesting contrast to the fact that managers kept trying to promote him as the major talent in the group. But what he really wanted to do was focus on the music and his own exploration of his talents. Nancy and Ann [Wilson, from Heart] were like, we need you to open up more, we need you to make that performance a bigger part of his stage presence. It’s one thing to fake being a rock god. We can all kind of do that, and it’s all pretty terrible. But it’s another thing to try to find your own rock god, that loves that attention and that experience.

Performing as a musician is a lot different than performing as an actor. As an actor, you can hide behind the character in the play, and there’s a director and other actors. When you’re a musician, you’re right there. It’s sort of like being a comedian. You’re giving the audience in real time something authentic from yourself. As an actor, my bullshit meter was going off like crazy at my first attempts to find my own rock star. Nancy and Peter were pretty instrumental. Cameron asked them to help me find a way to be filled with vigor and energy and also cool and a music nerd.