The distance between any two different pitches is known as an interval .
All intervals have specific names.
The interval between the fundamental and the first harmonic in the harmonic series is called an octave . Scales are derived by dividing the octave interval into different pitches. A scale may be defined as a pattern of different pitches that divide the interval span of an octave. All world music cultures derive scale pattern for their musical use and many divergent scale patterns are found worldwide. There are different methods for deriving scales and the method for deriving scales is called a tuning system .