Removing voice from song, help?

I am doing a project, and wanted to remove the lyrics or "voice" from the song: Count On Me by Bruno Mars. I just need the background music or main music from the song. Does anyone know how I could do this?? Please help, I need to know ASAP. I've heard some people do it and change the lyrics/ "voice" to the song on Youtube, such as a guy named Mr. Lee who does songs based on science stuff to popular songs like Black & Yellow. (Look him up on youtube, it might help you understand what I mean) Would it be a program or what?? Again, Please let me know ASAP, Thanks!