4ths 5ths Octaves – Writing

In this lesson, you will write 4ths, 5ths and Octaves by name.

These intervals are called “perfect” because of their pure sound.

The tritone is not perfect because it of its dissonant, harsh quality.

Remember that when writing perfect intervals, both notes will usually have the same accidental.

For example, if one note is natural, the other will be also. Or if one note is sharp the other will be sharp too.

The only time this doesn’t apply is if the interval uses the notes B and F, because B to F is a tritone.

Please press the Exercise button below.