Allows us to identify each instrument's distinctive qualities. it allows us to hear a difference in sound between a piano, clarinet, erhu, voice, or any sound.
The answer is Octave a symbol used to notate a pitch and its
duration. Note is also used to identify a pitch or a tone. Octave is the
interval between one musical pitch and another with half or double its
frequency. It is defined by ANSI as the unit of frequency level when the base
of the logarithm is two.
