An “interval” is the technical name for the distance between two notes, although it’s also used to describe the particular character of two notes being played together - a “major third”, “perfect fourth” and so on.
It’s useful to understand intervals, because they help you describe music independent of key - i.e., without having to refer to specific notes. This video tutorial covers the basics:
As you can see, there’s a bit of technical language involved in intervals, but it’s worth knuckling down and learning the basics, because understanding how they work and how they are labelled is incredibly useful.


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Good explanation of intervals. This video has a lot of value but would be better still if the volume level had been a bit higher. Keep up the good work!
Glad you like it! Yep, the volume was a pain with these vids for ages - I was uploading them to YouTube with everything turned up full, and they were still quiet. Now I’ve changed the format everything seems OK, so the later ones should be a bit more listenable!