Definitely The Hardest Part, I love that song, it is the first song that really stuck out to me on the album, and now listening to it over and over, it still is. Though I like Swallowed by the Sea, and Fix You, and For You as of now
Hardest Part
I totally agree. When I first heard "clocks" after listening to A Rush of Blood to the Head, I got the same feeling. After listening to X & Y, I felt the same about the Hardest Part. Great tune.