Boy, that's a good one. I've heard him do that song, but I don't have it to listen to. He also recorded Joni Mitchell's "Urge For Going". His versions of her songs are REALLY good, as is just about everything else he's done. Sorry I can't help with the guitar tuning. I play it in standard tuning. Any other Mudcatters have a copy to listen to to try and figure out Rush's tuning?