don't know how you can dothat....i would find a cd and use it, but here is a site i get backing tracks from for guitar occasionally....they have some songs by bands and stuff, but these aren't originals...they are version people made themselves without lyrics...so it could work for you too, but it would not be the original track...check it out, might be worth a shot...and if any guitar players stumble in here...check this out too...they do have some good jams to practice solos over and stuff.
FREE Guitar Backing Tracks