I'm sure any of you guitar player out there have had this problem. You have you guitar tuned to E, the standard tuning. Then you find a song (or 3 in my case)that is played the less common (and much cooler sounding) D tuning. I mean where every string it tuned a whole step down not where only the top string is tuned down. Anyway, my question is if I tune my guitar to D can I then put a capo on the second fret (one whole step up from the nut) and have my guitar be-technically- in E tuning. So far it sounds great but I'm not sure, if there are any professional musicians or anyone who knows more than I do about music than I do I'd love you insight.