Find Colplay song

I used to listen to this song randomly 2 years ago. I'm 99% sure it's coldplay. I have the melody in my head but i can't remember the lyrics besides the singer saying "soo... soooo... soooo.. soooo-aaaaaa" or something like this in the end of the song. What i clearly remember is the video: it's a a series of images of various people faces initially "insecure" looking and then progressively smiling, in black and white. I have searched the entire discography but can't find it, not even the video. It's shouldn't be hard to find it but somehow it totally desappeared!
Thanks in advance

I believe you are looking for "Clocks" by Coldplay