Deb, I wish you all the best of luck with this idea/project. Sometimes it's concepts like this that lead to bigger and better things. I have learned long ago to keep an open mind regarding innovation of any kind.

Time will tell how this will evolve.

Some of the simpler uses would be for recording and rehearsal and/or for trying different accompaniments and also for learning to play behind the vocalist in different keys (the voice can be pitch shifted).

Hard to predict how it would be received in a live situation, but if the audience is properly prepared beforehand, it could be rather cool and unique.

Ian