Teach Yourself Music Theory – 27.) Digging Deeper Into Intervals

If you are still not comfortable with the topic of intervals, I suggest reviewing previous posts. Otherwise, let’s go for a quick refresher:

An interval is the distance between two different pitches/notes. The two different notes can either occur at the same time (called a harmonic interval) or consecutively one after another (called a melodic interval).

Another way to classify intervals is by the span. Simple intervals are those that span an octave or less in length between any two pitches. Those that are of a greater distance than an octave are called compound intervals.

Previously, we have only named up to an octave. To name compound intervals, do the following:

• Take out the octave(s) distance apart
• Decide what is the leftover simple interval quality
• Name it (i.e. M2 )
• Then at a 7 to the value ( M2 +7 = M9 )

Intervals can also be classified by being grouped into their inversion relation; meaning, that when you take two notes and invert them by either having the lower note go above the higher note… or having the higher note go below the lower note, you produce another interval.

Let’s practice this concept. Start by writing middle C on a staff followed by the E4 pitch above it. Notice that this interval makes a M3. Now, take the middle C and move it up an octave to C5. You have now inverted the pitches, creating a m6 interval. So, M3 and m6 are inversionally related.

Practice writing two different pitches and naming the interval. Then, invert them and find the new interval.

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