Post here songs that are usually under 3 minutes but they're perfect as they are.

e.g.

Boards of Canada - Roygbiv
http://www.youtube.com/watch?v=KNE7eZdFRyg

The Knife - N.Y. Hotel
http://www.youtube.com/watch?v=zkQmrTbOK7w

The Knife - Listen Now
http://www.youtube.com/watch?v=iwALIumLKUI

Air - Mer du Japon
http://www.youtube.com/watch?v=jI4H_MOydv0

DJ Shadow - Mashin' on the Motorway
http://www.youtube.com/watch?v=I3wRBV5dVAQ

Metric - The List
http://www.youtube.com/watch?v=kEaZA2typWk

The Epoxies - Synthesized
http://www.youtube.com/watch?v=Cufnu_dJc-4

The Undertones - Teenage Kicks
http://www.youtube.com/watch?v=wGu2lu5XWE8

The Kills - Cheap and Cheerful
http://www.youtube.com/watch?v=G6wUPCqwWI8

Aphex Twin - April 14th
http://www.youtube.com/watch?v=MBFXJw7n-fU

Crystal Castles - Black Panther
http://www.youtube.com/watch?v=L3F5iFlYAac

Blur - Song 2
http://www.youtube.com/watch?v=SSbBvKaM6sk