I could help you out but you need to have authorisation/license from the production firm and/or composer, performer, copyright holder(s) granting you exclusive rights for minus-one. Normally if it's a formal event for which you want this done then the organiser or management team should've taken care of it.
Also, there are a few ways to carry this out and it can range from being relatively simple involving only polarity and frequencies to very complex involving digital/fast fourier transform analysis, sound programming and/or synthesis. That is why you have to be careful to whom you're paying what amount for what techniques are applied.