That Pink Floyd song is a great pick. I fell in love with this one when I was 15, roughly 20 years after it was released, and it still sounds amazing. Easily among their top songs.
And that track by Air is a beauty. Spooky. In the beginning, it somewhat reminds me of Alain Goraguer's songs from the soundtrack to Fantastic Planet (La Planète Sauvage), like this one:
It goes much further though, and has a great mood beyond the initial spookiness. French music is great.
Sigur Rós is fantastic. I love that album, and Olsen Olsen is one of their best. As moody as the song can be, there's a wonderful optimism there. Very cool video, too. I would love to see them perform in such a beautiful setting. I was reminded of this song when I watched The Tale of the Princess Kaguya (by Studio Ghibli) a while ago and heard this:
My favorite Sigur Rós track might be Ný Batterí:
Thanks for posting such good tunes, everyone! Sorry for posting a collection each time. Maybe next time I'll just post one?