Making a Minus One track

You would have come across this term-minus one track-if you are into music.A minus one track is essentially the song without the vocals.It is not so easy to get a minus one track;you have to get it from the music director or the record company,and they charge you well for it.But for some particular songs you can make a minus one track using software.I use a software from Adobe called Audition to make minus one tracks.Here's the minus one(you can all it karaoke if you want to) I made,for the song Barso Re from Guru:

http://www.esnips.com/doc/0887d0fb-443a-44fb-8e92-cca15c3b27a9/barso_minus1_mod