I am spending most of my time these days in standard tuning. The tune, Scarborough Fair is a traditional ballad from Great Britain. This arrangement is by Jean-François Delcamp. He plays it beautifully on the classical guitar. I've also heard a similar arrangement by Ulf Brocksten.
I liked the way it sounded on the 12-string. I played my Taylor GA4-12, with a capo on the 5th fret.