Two Steps From Hell compose music for ads, trailers and tv, etc. they don't normally release their material for public purchase but this is a must have!
If you've seen the BBC trailer for Frozen Planet, this is the album you'll find the music on, the full series trailer for this years Doctor Who? Yep, thats here too.
My only complaint is that, due to the nature of the compositions, the music is just too short, I want moooooore!!