There is no way to take a mp3 and seperate the words from the beat unless you have an MPC or a Roland Mv8000 or other high end sampling device. What you would need would be the seperate tracks, and thats hard if not impossible to get. Most hip hop instrumentals usually consist of a loop. You find a clean spot in the record and loop it. If you had a really good ear you could try to recreate the drums and other instruments by hand. If you could be more specific as to what you trying to do exactly I could help you more.