Cluin'

I've been using that pattern you've described as open D for years. I've tuned it as high up as open G#, but I have to use a custom set of light gauge strings for that reach or the strings break from the tension. I've also tuned it down to as low as open Bb, but again you must use a custom set of lower than normal gauge strings to keep your tension from responding like limp noodles. I've played a lot of bottleneck blues in this tuning.