VomitHatSteve
Hat STYLE. Not contents.
In fact, there is a software that does exactly this from Audionamix. And they have done this for some of the recent hollywood movies! They have been at the NAMM conference for almost 3-4 years now. You can get it pretty good if you use their spectral editing software.
Here it is: Vocal Isolation: Isolate and Extract Vocals / Audio Separation | ADX:
Adding: In fact, here is a song I did with the software: https://www.youtube.com/watch?v=iA2qILlIHfE. Forgive my singing please
Holy butts, that is the most over-engineered website I've seen in a while!
Cool looking software tho.