I found my favourite piece yet, I think it is at 3:17 of the latest video, it shows you the music that plays when you wake the guardians up. It sounds allot different to what we are used to hearing in zelda and I think it is very effective in conveying the urgency of needing to find the next light tear.
http://www.youtube.com/watch?v=GurOD1YChC8
http://www.youtube.com/watch?v=GurOD1YChC8