Pink Moon by Nick Drake. There was a documentary playing this weekend in LA about Nick Drake that I couldn't make it to which made me think of posting him.
If you're not familiar Nick is one of those "musician's musician". He made a few recordings in the 70's but suffered from acute shyness and mental illness. He ended up taking his life early but his music has definitely lived on with cult like status. Most of his stuff has a sad air to it but this song is perfectly pretty and quiet.