1Full Version : This is the full backing track with backing vocals ( if the original has ) and without backing vocals ( if the original doesn't has). The full version is the most complete version of the song without the lead vocal.
2Without B/Vocals : Like name says, is the backing track without the backing vocals. Is just like the full version without the background singers.
3Without guitars : Is the song for guitarists, the song do not have guitars, no lead and no rhythmic and do not have backing vocals neither.
4Without Bass : Is the backing tracks without bass and without background vocals. Is for bass players who want to play all along the song.