The Dallas School of Music has an online program http://dlpmusicprogram.com/ on Jazz theory. It includes play along examples of each lesson. They also have some free blogs on many Jazz subjects. Another offering is the "1 Series" which is a free daily lesson. They have a step up program connected to the 1 Series which includes MavenLink which allows the user to connect directly with various professors. They have set up a program for me to learn and play the 60 chords that are commonly used in Jazz. I'm supposed to learn and play in Musical context the five chords in each key over a period of a few months. When each key signature is mastered, I am to upload a video for them to critique. For me, it's helpful to have a little bit of accountability to stay on track. $100.00 per year!