What is an octave?
In music theory, the octave is a musical interval consisting of seven notes, for example, from one C to another C. Two notes that form an octave sound very similar and differ in pitch or frequency. The frequency of the higher note is twice that of the lower note.
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.
### Instruction: What is an octave?
### Input: 
### Response: In music theory, the octave is a musical interval consisting of seven notes, for example, from one C to another C. Two notes that form an octave sound very similar and differ in pitch or frequency. The frequency of the higher note is twice that of the lower note.