I asked JT a question in the double neck guitar thread over in basses a question about how he tunes both necks. His reply made me think of something that I never really stopped to think of before until now. He tunes b-e-a-d-g-b-e, which I know is an alternate tuning and guitars tune e-a-d-g-b-e. But in both cases the G to B string are only tuned a 3rd. Perhaps someone can explain to me why the one string is tuned a 3rd rather the 4th like the rest.