I suggested it earlier, I will add this again as I think it might be relevant.

Maybe it is a good idea to have a splash screen on the start with couple of video tutorials offered, right from the "start".

For example:
1)Getting started.
2)Complete backing track making.
3)All tutorials.

For the first one something very simple 3-5 minute walk through on basic stuff.

For the second something more complex: bar changes, tempo changes, use of soloist, etc. Still making a single song, not just parts of the project. So the first time user sees the whole process / workflow.

And third will point to website to all tutorials.

And of course have a tick on the bottom "do not display on start"
I have seen similar approaches on couple of software titles. Very effective.