A LOT of original songs were composed this century. But it is really rare to see something GOOD. That's Sigur Rós.
Tracks 1 to 4 give a delightful sensation of being in a nice mood.
Tracks 5 to 8 bring you to the "dark side of the moon" (yeah, I also love pink floyd \o/). A relaxing melancholy comes in this part, mood gets dark as you look into yourself..