How to remove vocal from audio songs?

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My friends would like to performance in our college ceremony. She will sing a song. Now i need one software what can remove the vocal of singer but music will be. Because my friend will sing a song with the music. Now i need one software. So please my friend help me about this purpose. Tell me one software name what can remove the vocal from a songs but music will not delete. And also tell me the processing for delete the vocal. Thanks in advance.