My journey to bluegrass music is a bit different than most folks as I started playing folk and rock n roll, then took a turn to classical and flamenco, then spent many years involved in performing jazz and blues and finally, most recently bluegrass. Of those styles, I find bluegrass the most challenging, mostly because I prefer to approach all soloing as fully improvised at the moment without preconceived lines worked out. And also, bluegrass requires, no demands, precision along with slick creativity.
To help me with this process, I regularly put together various backing tracks using BIAB (Band in a Box). This is a great tool for practicing solo lines when you would rather spend time practicing your soloing instead of taking the time to record each instrument.
However, here is something a little different for you grassers out there. I teach various classes in improvisation including a jazz improve class. Here is a simple Blues in F using the melody to Bag’s Groove. Tunes like this are fun to practice your scales with when you are wanting to just relax a bit from your high speed picking. Enjoy.