As much as I think I know about music, honestly I haven't even scraped the surface of what is out there.
I know of Fleet Foxes, but I don't know their oeuvre, not really.
I heard "Mykonos" on satellite radio. Once again, I assume 'alt nation' means it's newer and alternative. Usually it's neither of these things. The song is 11+ years old.
But I like the vibe. Folkish with some alternative. There are parts later on that are extremely reminiscent of Crosby, Stills, Nash & Young. This is not a bad thing.