This is my current favorite song. I've listened to it probably 30 times in the past two weeks.
The Forms (whose style Wikipedia considers "math rock"), are a Brooklyn band that formed in the early 2000's and have since released two albums with a third on the way.
The song features The National's Matt Berninger and the combination could not be better.
At just under three minutes, the song goes on for just the right amount of time to leave you wanting more.