I have been tabbing on here for many years now, but I wondered today when I was writing some tabs, WHY is it that capo placement is always expressed in roman numerals? I don't know where I learned to do it this way, or WHY I do it this way, but I feel its proper and that everyone else does it this way so thats how it should be done. Its not like capos were invented by the romans or anything, but ever since I was reading tabs when I was a kid, that was the way of the world. So I never questioned it or even thought about it until just now. Does anyone have any insight? Is there a specific reason it is done this way? Any compelling theories or ideas would be welcomed.