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!
"I was playing around with the chords you listed for the song. The song is capo 2, not capo 3. Alternatively, it can be played open without a capo. The G becomes A, the C becomes D, and the D becomes E. It sounds pretty good but I think the capo 2 chords sound a little better. In the open chords, a D9 can be substituted for the D to let the open E string ring out. Give it a try."