Where can I get music/accompaniment only?

I'm a graduating senior, and I sing in the honor's chorus at my school. We're having our spring concert next Wednesday, and every year it's tradition for the seniors to sing a song by themselves if they want. I want to sing 'When I Get Where I'm Going' by Brad Paisley ft. Dolly Parton, and I'm having trouble finding the music without words. I have to have the cd ready to sing just for the cl tomorrow to make sure I can get through it (without crying :P) and so the teacher can put us on the program. So, my question is, does anyone know where I can find the song without words online, and preferably free? Any help will be very much appreciated. Thanks!