This is a good old traditional number done by Flatt & Scruggs. This arrangement of Ain't Gonna Work Tomorrow will give you the main melody which will let you lay a foundation for more flashy playing in the intermediate and advanced versions.
This version of Ain't Gonna Work Tomorrow teaches you how to bring in longer phrasing to create a more in-depth and virtuosic solo. Just wait until the advanced version!
This solo incorporations more bluesy elements into it. Check out the groovy double-stop lick in measure 5!