You would need permissions/releases from the publisher(s)/copyright owner for the song, as well as from the record company for the track itself (that particular recorded version). Do you have a particular track in-mind?
Without them making any coin, I'd say chances are slim...
Thanks for comment i dont have a track in mind but im thinking of starting doing edits/bootlegs/remixs and uploading to soundcloud, but first want to find out how it works legally how to get permissions etc.
Are you planning on selling the edit/bootleg/remix? Editing/sampling/altering copyrighted audio is illegal in almost every case but in general if you're not causing financial harm to the creators and owners of the material they won't be too concerned. Most bootlegs are not cleared, you decide how you want to approach it though