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.
### Instruction: What is an octave?
### Context: 
### Answer: 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.</s>