I’ve now begun work on lesson 14:  learn bebop blues.

This chord sequence is a long way from the basic three chords that are commonly used. Bebop blues still contains 12 bars and hits the IV chord at bar 5. But there are big differences. For a start, chord 1 is now a major 7th rather than a dominant 7th. This means that you can no longer rely on the blues scale. We then encounter a series of descending II-V patterns.