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An octave is the interval between one musical pitch and another with half or double its frequency.

In other words, an octave  is the same note at a higher  or lower pitch.

Examples Of Octaves

Open String Octaves

Use Of Octaves Example

Here is an example of real world use of octaves. This is the fiery intro to the Jimi Hendrix classic “Fire”.

Octaves On All 6 Strings