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• In this video, I’m going to give you an introduction to musical intervals.

• A musical interval is just a unit of measurement between two pitches,

• and we can use numbers to show the relative distance between these pitches.

• If were talking about something like a perfect fifth, which sounds like this,

• I’m just going to show you with my hands.

• Say this was here, then I want to do a third, it would be narrower, like this.

• Then if I wanted to do a bigger number,

• the distance between the pitches would get bigger too.

• It’s just a unit of measurement and of course the keyboard works great

• to think about intervals because you can see how far apart the piano keys are.

• let’s say that we wanted to write an E, and we want to do a perfect fifth up from E.

• This is really easy, because all you have to do is count through the alphabet.

• Here’s the perfect fifth up, and were just going to count like this:

• start with E, so there’s E, F, G, A, B.

• That’s five, so well want to write a five.

• So I’m just going to go like this: one, two, three, four, and there it is.

• That’s a fifth, and this P I have in front of it is a little more information that helps

• describe the sound to me, and well talk about that a little bit later.

• So let’s try another interval, and then well see what they sound like.

• Let’s go to treble clef this time, and were going to do a third.

• Let’s do a third down from this. I’m just going to do three down.

• Again, all you have to do is count, and there are two ways you can count.

• You can count down like this: one, two, three, and you know the other note has to be here.

• Or, you can count down in the alphabet, so G, F, E, so you know it has to be an E.

• So it’s really just counting. And were going to do one more.

• Let’s see, this one is going to be a seventh.

• Were going to go from here, and this is going to be a seventh up.

• So from C – again, you always start counting with the one that youre on right here

• so C, D, E, F, G, A, B. That must be a seventh. Or you can count like this.

• That’s how you notate those intervals, and were going to see what those sound like on the keyboard.

• The first one was a fifth, and it was up from this E down here.

• That’s a fifth, and the next one I had a third, which sounds like this.

• And then I had a seventh. Like that.

• You might notice these all sound a little bit different.

• I’m going to go back to that first one I played where I had that P in front of it

• and I said it was a perfect fifth.

• The general category of these types of intervals that I’m playing right now

• that general category is called perfect.

• they have kind of bell like sounds, kind of clear, you might hear that a lot of the

• orchestral strings are tuned in fifths when they tune their instruments.

• And so the general category for fifths and fourths and octaves is called perfect.

• Were going to go to the next category.

• This is a third, and you can see it easily on the keyboard because one, two, three.

• This is a sixth. It turns out that thirds and sixths are both in the same category too.

• I’ll play a few more of those. These are all thirds.

• And then here are a few sixths. Like that.

• The general name for all these kinds of intervals is called consonant.

• And there’s one more category, and it’s called dissonant.

• We were looking at fourths and fifths and octaves as being perfect,

• but there’s something called a tritone that's in between a fourth and a fifth that's considered dissonant.

• If you want to write one of these intervals, cause they sound kind of neat, you can do two things.

• You can either make a fifth and shrink it, or you can make a fourth and make it bigger.

• This is a fourth, and what I’m going to do is use an accidental to make it a bit bigger.

• I’m going to make it a half step bigger.

• So I could do it a couple different ways.

• I could put a sharp here, and that would work really well.

• Or, I could go back over here and I could put a flat there.

• Either way I have this interval. I could raise the top or lower the bottom.

• And then I can do the same type of thing with a fifth.

• I can make a fourth bigger or a fifth smaller to make a tritone. So well just do that.

• So here’s a fifth, and I’m going to raise the bottom up to make it a little smaller.

• Of course I could also do that. I’m going to play with what these sound like on the keyboard.

• So here’s that fourth that I played, and that I notated.

• And you can see that it’s very clear sounding, it’s perfect,

• category of perfect intervals, but now I’m going to lower that G.

• It changes the sound and now it’s dissonant. Or I could do it the other way.

• Raise the C. Very dissonant.

• I’m going to do the same thing with that perfect fifth.

• Here’s that fifth, very clear, very bell like.

• But if I raise the bottom of it, all of a sudden, it’s dissonant.

• Same thing by lowering the top.

• And that’s all the lesson for now.

In this video, I’m going to give you an introduction to musical intervals.

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# Music 101: Introduction to Intervals

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songwen8778 posted on 2016/07/31
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