Separate vocals (lyrics) from mp3

I want to develop a media player (or plugin) that separates lead vocal(s) from the music, in a mp3.? $0$0$0$0It could be done in few audio players and processors like Audacity, Soundforge. But they are all complex to use and none of them do a good job.$0$0$0$0$0If you can do it perfectly, you have the project.? $0$0$0$0$0I am willing to pay $1000 for a good demo.? $0$0$0$0$0Do NOT bid if you are not 100% sure that you can do it. I will not discuss further if you can't deliver a working demo that I can test myself.? $0$0$0$0$0If you are really good, I am also willing to discuss profit sharing. I am in US and have a lot of marketing and sales experience.? $0$0$0$0$0$0$0