The other main concept is the the Random Chromatic Approach, something I did not write much about and I think it is worth considering. The RCA can be thought of as a Post-Bop chromatic approach (as opposed to a Bebop chromatic approach). The Bebop chromatic approach, or 'enclosure' as some educators like to call it, is a way to link ideas together, add interesting directional elements and to give more forward motion to a line. Below are a few examples of Bebop approaches from Steve Neff's Approach Note Velocity book:
Garzone has an interesting take on the chromatic approach, and it is quite an easy, especially compared to the difficulty of his Triadic Chromatic Approach. Below are a few pages from Garzone's ebook that comes with the TCA DVD.
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If you follow Garzone's guidelines you will end up with very modern sounding chromatic lines that have a lot of forward motion. These random chromatic lines serve to same purpose that traditional Bebop chromatic approaches: they give lines interesting direction, they link ideas together and they add forward motion to the line.
In the TCA DVD Garzone has several play-along tracks where he trades fours, giving the student a chance to respond to his phrases. A former student of mine in Japan transcribed George's fours from the DVD and it is quite interesting to see exactly how he constructs his chromatic lines. George doesn't strictly follows his own rules (also the case when it comes to his TCA), so do not be surprised if you do not see the concepts from the PDFs above strictly applied.
I highly recommend both of the Garzone/Jody Jazz DVDs to any student looking to add more modern concepts to their playing. Also worth noting is the fact that Jody has drastically cut the price of the TCA DVD since it was first released.