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Thank you for your question. I am a solicitor interested in intellectual property law. If you are using the whole music even with different lyrics (I hope I have understood you correctly) then that is a blatant breach of copyright if you don’t have permission. The only type of exception here may be a parody sketch or similar which you can learn about here http://www.copyrightuser.org/understand/exceptions/parody-pastiche/ but from what you say that is not the case. You are using someone’s music and therefore have to seek permission to do so to perform it in public. Happy to discuss further. I hope that helps. Please leave a positive rating so that I am credited for my time.