 Hi, in this segment we're going to take a look at tritone substitutions and they work really well to create some variety in the music that we're playing. So we're going to take a look at the different ways that we can create tritone substitutions to make your music a little more interesting. We're going to start, in this case, in the key of C. So here's the C major 7 chord first. Okay, there we have the C major 7 chord and we're going to do a simple 2-5-1 progression with the C major 7 chord, the D minor 7 chord and then to the G dominant 7 chord and back to the 1 major 7 chord. We're going to continue to use our 3-note shell voicing that we've been looking at so far so the roots in our left hand of the C chord, the 3rd and the 7th are here. Then we move to the 2 chord, the D, 3rd and 7th here and then we move up to the 5 chord. The F now becomes our 7 and we move down to the B which is our 3, that gives us our dominant sound and then back to C. Again, the B stays for our 7th and we move the F down to E for our 3rd. Take a listen to this progression and see what you think. Now we've taken a look at a progression like that in the past but now we're going to give you an option to make some changes in that and we call those tritone substitutions. In this case, instead of playing, here's the C major, the D minor, instead of going to the dominant 5, G7, we're going to come to D flat and we have D flat, F and now we're going to call this note C flat instead of B so that it is the 3rd and the 7th of the D flat chord or a flat 2 chord. So our right hand is really not going to do anything differently than we did earlier. C major, D minor and then we were using the F and the B for the G dominant 7, now we're using it for the flat 2 chord and then back to 1. Now let me make those changes on the recording and we'll take a listen to what that sounds like. So you can see that just simply by changing to the flat 2 and using the same right hand pattern, the 3rd and the 7th of the dominant chord, but now they switch roles. Now the top note is the 3rd and the bottom note is the 7th, we get a little bit of a different sound that makes it interesting. So experiment with that in all the keys. You don't want to use too many tritone substitutions or people kind of know that they're coming so use them sparingly but experiment with those and see what you think.