j/k - he's the only one of those guys I don't have anything from. Not that I have much from the other two, but at least I'm more familiar with them.

Gordon Lightfoot - best known for his Canadian Railroad Trilogy, I think, or at least that's the primary song most people I've met seem to know him for. I've got a copy of 'If I Could Read Your Mind' and it's pretty damn good.

as for Tim Buckley, I'm not well versed on the bulk of his catalog either, but certainly Dream Letter (Live in London 1968) is a thing of beauty.