Via Will McGuirk: Critically acclaimed Ottawa band the Acorn has two free EPs for you. The first Ear Worms contains "Ear Worms: 12 - 30 sec. songs written and recorded on xmas eve." the second is Little Elms - "a short 4 song EP inspired by end-of-summer sun-stroke". Both are available at the band's web site theacorn.ca.
There are also a few older songs you can get in the podsafe download section of this site.