Does anyone know how he tunes his part on Violet hill at Brixton? I also can't figure out the tuning for Yes. It seems for most of the album he uses a specific tuning. Can't figure it out!

Yeah I gotta agree with you on that one ... it seems the whole album has a certain tuning. There's no way that "Yes" is in standard tuning. Coldplay is known for having those elusive tunings. What I wonder, is how they come up with them? Even the new "Prospekt's March/Poppy Fields" track sounds like they are either using some very interesting chords, or using an alternate tuning. Anyone have any insight on this? Namely Kapone or Stephanbass?

Yes is a mystery to me, I've seen numerous very different tabs for it, all I know is he uses a capo live. I don't know about brixton, but I'm pretty sure Chris uses standard tuning for Violet Hill.

Violet Hill chords are in standard tuning...

Its possible that they use tunings other than the standard since they change instruments every song or so... :) But yeah Violet Hill is in standard tuning... trying to figure out the others...

It's probably not so much that they use alternate tunings ... it's that they use really interesting chords. I came to that conclusion when I watched the soundcheck for Prospekt's March/Poppy Fields ... he just had a capo way up on the fret ... like 7th fret or something (video is a little blurry). That explains how he had that really bright sound to it. I figured it was a tuning similar to "See You Soon," because it had a lot of ringing notes in it.