"Grow a Brain 2 (2013 Remix)" [mp3 removed -- this track is now on Bandcamp]
A short drum and bassy track from '07 got an overhaul: tweaks to the bassline and some piano chords over the top. There is a story arc, too: the chords get prettier as the bass becomes more manic.
Update, Mar. '13: Reposted - forgot to add the metadata.