So often, the "hidden" tracks on CDs do not contain much of interest. They are typically reserved for curiosities that the artist wished to include, but did not feel they meshed with the rest of the album.
One exception to this is what I call track 13 on ovalcommers. Technically, it is the second hidden track, twenty-five some odd minutes past the ending of 11, and the last song on the CD.
I love Oval's work. I like anything that is glitched beyond repair and torn like a ragged sheet of paper. Track 13 combines an eloquent mixture of clicks in harmony, and does the trick for me.
(Implicated thread starter: What are your favorite hidden tracks, and why?)