The Mars Volta - Day of the Baphomets
I can't emphasize how much better Clip Fix made this whole album sound. Before it was an overly distorted monstrosity; now it's still pretty distorted but it's possible to discern individual instruments (quite an impressive feat since there are about eight or nine of them playing at once in some parts). This song has been one of my favourite items in their discography since I first heard it though.