What's an Interval ?
An interval is the distance between two notes, each one is represented by a number (1,2,3,4,5,6,7...) and a prefix related to its quality ("M" for major, m for minor, "P" for perfect, "d" for diminished and "A" for augmented). There are five different qualities. An interval can be melodic, when the tones are successive (played one after the other) and harmonic, if the notes are stacked (played simultaneously). Knowing the name of each interval is very important for any musician, they are essential elements of music theory. Intervals are very useful to understand how chords and scales are built. This article shows you how to make the difference between them.