The Great Capo Debate inevitably leads to the 'Funny Tunings' Debate...

If you get the sound you want, and the audience appreciate your efforts, snotty-nosed purists haven't a leg to stand on!!

Anyway, who has the right to say what is the 'correct' tuning for a guitar, banjo or whatever? There isn't even a standard for melodeons, which are much more difficult to tune!!