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My name is Roger Fedyk.
I'm not actually bidding on this, yet. As well as being a software developer I am also a recording engineer with my own studio in Melbourne. What you are asking for is virtually impossible except if there are some very special circumstances in the mp3 like the left and right channel voice components are actual 180 degress out of phase. I won't bore you with any more technical details but if you want to send me the mp3 I will tell you if it can be done and how much the vocal can be reduced if everything is right.
BTW even where you have a chance to do cancellation it is never complete. There will always be vocals there just at a much reduced volume.