Long weekend approaches, currently suffering from "presenteeism" at work, I think I'm one of three people on this side of the wall at the office. I found a really great set of recordings on Global Groove, slowed down versions of the Robert Johnson recordings, and am taking the liberty today to play through a song-by-song playlist of the classic v. slowed down versions. So far the difference is about a 1/2 step, or 100 cents. Maybe a little less...