In this guitar lesson we look at the jazz scheme concept of using a diminished chord as a 7b9 chord. You should doubtless check out the jazz lesson series on the web site if you are getting wedged with the concepts here – and there are clarification about this lesson there too – and I reckon it is simpler to read some of this stuff than take note – helps you know it nearer, imho. It’s kind of a chord substitution (you’ll often see it called that) but I reckon it is more just using a shape a different way, it’s not really a substitution in the proper sense of the word… more on the web site about that!Taught by Justin Sandercoe. Full support at the justinguitar web site where you will find hundreds of lessons on a wide range of subjects, and all the scales and chords that you will ever need! There is a fantastic forum too to get help, no matter what the problem. And it is all really free, no bull. No try out lessons, no memberships, no free ebook. Just tons of fantastic lessons To get help with this lesson (and for further info and tabs), find the Lesson ID in the video title (like ST-667 or whatever) and then look it up on the Lesson Index page of justinguitar.com www.justinguitar.com Have fun .