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|1st and 2nd Strings - Intervals#Hot Cross Buns, Championship Editition|2nd Song}}
Two notes form an '''interval'''. This can describe either the ''distance'' between them, in terms of pitch/semitones (or even further in terms of [[Equal Temperament and Alternative Alternate Tunings#Cents|cents]] - a topic discussed later in advanced harmony and tunings), or the sound produced by playing them together (simultaneously or in sequence). '''Understanding intervals ''IS'' understanding harmony.''' Scales and chords are composed of a fixed set of intervals that give them their unique sound. Thus, the key of C Major sounds quite like G Major but quite different from C Minor.
You can determine the interval between any two notes by counting the number of notes between them in the common 7-note major or minor scales (or other modes of these scales). For example, F is the 4th of C: