I was playing around today and I accidentally stumbled across the chords for Brian May's "Let Your Heart Rule Your Head". It's not perfect, but here goes:
Brian is using a capo on the third fret. The verse goes from a G chord to a D and quickly goes to a C. The Chorus alternates G and C with a D when the word "tonight" is sung. The bridge is a little tricky, but it probably modulates to a minor key. I gotta work on it a little bit more.
So there it is. Hope you enjoy it!