Good news: we've added all the backing track parts for everyone here. We bundled the files for each song together in zipped stem packs which you can find in the Additional Study Materials section on the site.
To find the stem packs, go to the learning channel and click the blue "Study Materials" button. Once the page loads, scroll down to the bottom to get to "Additional Study Materials" and you'll see them all there in alphabetical order. There's also a search box for easy reference.
Now you can download these stem packs and load them into any recording program (Garageband, Pro Tools, Logic, Ableton, etc) and make your own mixes. So if they don't want to hear the mandolin or guitar, you can turn them down or off. You also play with panning and add your own effects, the choice is yours!
Original Content: Stem Packs for Backing Tracks Now Available