If you want the best sounding instruments, you will need the Real Tracks. My advice is to buy as much of a Biab package as you can. I upgraded to the Ultra HD pack and it comes with ALL of the Real Tracks, including Smooth Jazz.

Check out my demo song I made yesterday. It is one style with 5 Real Tracks, SmJzPop

https://www.youtube.com/watch?v=POyWq8ih95c

Trax