How do you change a song into a karaoke track?

Tonight I am doing a Christmas, Boxing Day and New Year Celebration and it is a Karaoke night! All of my friends who are coming have told me what karaoke tracks they would like, i have had them downladed with vocals and the only thing now is that some people would like them without so can you please answer this... show more Tonight I am doing a Christmas, Boxing Day and New Year Celebration and it is a Karaoke night! All of my friends who are coming have told me what karaoke tracks they would like, i have had them downladed with vocals and the only thing now is that some people would like them without so can you please answer this question with an internet link to software you can download FREE (it doesn't matter if it is a 7-day trial for example because i only need it today) and change a song into a karaoke track! many thanks!

shabbaollie
Update: PLEEEEASE ANSWER IT!!!!!!!
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