Ive seen this video before. Meh
I see people posting on how to learn tritones all the time, but if f you really want to learn about tritones and fully understand the concept and application of putting them in gospel songs, then you nee to get Jamal's 'Tritone Extravaganza." Im sure GospelMusician would like that. lol
No lie, its the best info on the subject as it pertains to gospel applications. I worked with it, and now I can pull em out during playing in pretty much any key.