There's no way to do this. It's the same as we'll say trying to remove say a character from a video. There are work arounds, but nothing perfect. What you found is probably as good as you're going to get. Unless there is an actual instrumental version of the song...
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Desktop * Athlon X2 4200 | 2G RAM | 160G HD | 7600GT
Laptop1 * C2D T5550 | 3G RAM | 120G HD | Intel x3100
Laptop2 * C2D T5250 | 2G RAM | 160G HD | Intel x3100
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