Here are the matches for the intervals with their names:
- Octave: The interval between one musical pitch and another with half or double its frequency (e.g., C to the next higher C).
- Fifth: The interval between two pitches that are five scale degrees apart (e.g., C to G).
- Second: The interval between two pitches that are two scale degrees apart (e.g., C to D).
So the matches are as follows:
- Octave: Interval between one pitch and another with double the frequency.
- Fifth: Interval of five scale degrees (e.g., C to G).
- Second: Interval of two scale degrees (e.g., C to D).