"Takk..." is an album by the icelandic post-rock band Sigur Rós that was released in 2005.
"Takk..." incorporates a lot of ambience and a signing technique called "vonlenska". I was recently introduced to the album by a good friend whole is the guitarist for my brother's band, and I fell in love with it as soon as I started listening to it. The music is very ambient and makes you feel as if you were exploring some kind of cave. I would recommend this album to anyone, even if they think they don't really like post-rock.