Originally authored by Wayne Chase and printed by Woodside Rose Press in Canada. I purchased this poster over 25 years ago and have been looking for a reprint for a very long time. It looks like it is now reprinted by Roedy Black Publishing, and offered on their website, How Music Really Works.
I know the Internet is full of guitar chord charts but this poster is the best I have ever come across. The information that is printed on this poster is very impressive. The layout of the poster makes for a quick reference of diatonic chord progressions, starting with simple triads all the way to extended and altered chords, in all keys!
I can’t tell you how many times I have referenced this poster during a lesson. It looks like it is offered as a printed download but I would recommend springing for the extra cash and get the actual poster. It looks great and having it on the wall in your practice room will be like having a full time, personal guitar instructor at your call, for the price of an hour long music lesson.