The Major and Minor Third
okay, It's time to talk about with third now. Third is not just another interval like the octave or the fifth. This one has a peculiar thing that we have to deal with when we deal with the third, and it's very important. So to understand it, let me go back a little bit. I talked a minute ago, the major and minor and the biggest interval that changes between Major and minor is the third. Ah, in terms of I shouldn't say the biggest interval. I should say the most important to us in terms of making cords, which is what we're about to be doing is the third. The third is very important for cords, and the third is what makes the difference between a major and a minor cord. So let's Cohn, let's find 1/3. Okay, so this is relatively easy, right? I'm on C. So I'm gonna go up some on 123 There's my third c t e is 1/3 in the key of C major. If I count up to notes in the key, I get to 1/3 That's 1/3 now. This is a major third let me show you what a minor third looks like in to demonstrate that I'...
m just gonna put the whole C major scale up here one more time. Here's my major scale it zoom in a little bit. Okay, so this is a major scale. Let's count up 1/ from D in the key of C. Not in the key of D. Some is going to stick to the key of C buying an account from D up to 1/3. 123 So D toe f eyes 1/3 on C T e is 1/3 cap. Hold on to that for a second. Let's focus in on just those two. Interval. Throw that away. Let's move that there. And let's move these two notes out here just so I can take a good look at him. Okay, this one c t e is the major. Third, this one did. A F is a minor third. How do we know the easy way to know is to count up on Lee half steps? Okay, So 12345 5/2 steps. Including the first and last note here. 1234 That's the difference. the difference between a major third and a minor third is one half step. So this is a major third. If I wanted this to be a minor third, I would take the third and I would lower it 1/2 step. This is now a minor third because this is only for half steps away. Put that back up to a major third. This is a minor third. If I wanted that to be a major third, I would raise it 1/2 step, which would take it out of the key of C major. Um, and that would make it a major third because I would have 5/ steps in between. But a major third built on D does not occur in the key of C major right, because that would require an F sharp, which is not in the key of C major. So as you build thirds throughout the scale, way have different alterations of major and minor. Third and not alterations, meaning like blue go major than mine. Answer the major turn. They don't go back and forth that clearly. It's just there are some major on some minor thirds as we go up there. Uh,