You know you need some serious equipment to even get an acceptable vocal strip. It's pretty much impossible to take the vocals out and keep the music without some shitty after effect. Your better off searching for the original instrumental version as most CD singles have the instrumental version on it. You can always try it yourself, I use cool edit pro 2.0. It has a feature to remove vocals but the result is really unusable. I think cool edit is owned by adobe now so the name is audition and of course the price has been trippled by the marketing geniuses at adobe.