This lesson assumes that you are already familiar with Fifths. If you have logged in and been following the lessons and practice apps in order you should already be familiar with them.
If not, you can learn about Fifths by going to The Fifth.
You will also need to be able to sing Unisons and Seconds How to Hear Unisons and Seconds, Thirds How to Hear Thirds and Fourths How to Hear Fourths.
When identifying and singing Fifths by ear, we will not include Augmented 5ths because they will sound identical to a minor 6th.
The Tritone is another name for the diminished 5th which is also the same as the augmented 4th. We will use it instead of the term "diminished 5th" when identifying the interval by ear because the augmented 4th and diminished 5th sound identical.
When singing melodies it is helpful to know that the diminished 5th only occurs between ti and fa in the major scale. All other 5ths in the major scale are Perfect 5ths.
The following chart has some pointers to help you hear and sing fifths. Some people find it easier to associate an interval with a song. There are a few examples listed in the chart, but you can find many more by searching online for 'Songs that begin with a [insert interval here]'.