FYI there are some great backing tracks on YouTube for Bluegrass and Old Time tunes. Here's one for The Big Sciota. Here are two, each of which shows the chord progressions. Both sources have many other backing tracks.

https://www.youtube.com/watch?v=rdXv...DMMrdXv86ut1Kc

https://www.youtube.com/watch?v=MwPbRmDsCUE&t=38s