The Animal Collective: Merriweather Post Pavillion
This album from the Animal Collective seems to be on a lot of top 10 lists of 2009. (See Pitchfork ). Personally, I'm not yet sold on the entire album. Maybe I have to listen to it some more? That said, track number four, "Sumertime Clothes", is a great song:
You can download the whole album from the torrent here.