What is a note?

This is a question – though rather simple – that must be answered before we attempt to learn music theory. A note is a vibration in the air. Each of these vibrations oscillate at a different speed. This speed, known as frequency, defines each note.

Music does not generally consist of just one note. When we hear music, our ears are often listening to the interactions between multiple frequencies, rather than just individual frequencies alone. Below is a diagram of this concept:

Move the slider to change the interval.