I've been browsing Youtube for Bluegrass covers all day. Here's a very limited selection. Not going to post everything I liked. Hope I'm not annoying anybody. I'm sure more than a few of you are thinking 'wtf?'.
This is more pure country, it's a cover of a Charley Pride song, but she changed it from a basic normal scale to some kind of weird semi-oriental scale that makes it sound much more mysterious and old-timey. I give it a special honorable mention.
I am not a musician, but I think that it wasn't difficult to do the Bluegrass interpretation.. The base - original had a different name. Blues and Bluegrass aren't the same, but still... Another Cover
You are way ahead of me on the Scales part. I have been listening on Youtube and if I go too far Westward, they go heavy on percussion. I know that they like percussion on the Indian Subcontinent as well. Not the best examples, but sort of in this direction. Assyrians don't consider themselves as Arabs