This is a really remarkable MP3. Someone has taken two nickleback songs, mixed them into a single mp3 with one song playing in the right speaker, the other in the left. Simple idea, remarkable result: they are musically almost exactly the same--same key changes, same pauses, same overall structure. It's really uncanny.
http://www.nintendorks.com/brandon/archives/000475.php
Turns out it's quite an old link (from back in april), so maybe it's been posted before, but it's new to me.