There's a list of hacks here:
<a href="http://musichackday.org/info/Hacks" rel="nofollow">http://musichackday.org/info/Hacks</a><p>I particularly liked the Music Zeitgeist which analyzed the lyrics of popular songs from the 1950s to the present day:
<a href="http://zeitgeist.cristianobetta.com/charts/decade/1980" rel="nofollow">http://zeitgeist.cristianobetta.com/charts/decade/1980</a><p>The "best hack" prize went to Music Bore - an automated DJing system:
<a href="http://musichackday.org/index.php?page=MusicBore" rel="nofollow">http://musichackday.org/index.php?page=MusicBore</a>