From the page: "Joel Falconer wrote a great article on how to use your ear to detect intervals with song associations. In this article we窶ll look at how you come up with those intervals in the first place.
An interval is the distance between two notes, with the first note counted as 1. From C up to E is a major 3rd. From D to up G is a perfect 4th, and so on.
There are two parts to an interval: a modifier and a number. First let窶s see how to figure out the number of an interval."