I've been trying to figure this out, but I just can't. I asked some guitar player friends of mine, and they can't figure it out either. The question: Why do guitars defy logic by stepping out of the normal 4th tuning pattern, and using a B String? On a 6/7 string bass, it's tuned to C (like it should be). I can't think of any reason why they use the B string, except maybe it makes some chords easier? Besides that, I can only see the B string complicating things. Anyone have a logical explanation?