If the two notes in an interval are played simultaneously, the interval is said to be

harmonic.

If the two notes in an interval are played simultaneously, the interval is said to be a harmonic interval.

If the two notes in an interval are played simultaneously, the interval is said to be a "harmonic interval." To determine the specific type of harmonic interval (such as a major third, perfect fifth, etc.), you need to consider the distance between the two notes.

To find the interval between two notes, you can follow these steps:

1. Identify the letter names of both notes. For example, if one note is C and the other is E, the letter names are C and E.

2. Determine the number of letter names between the two notes, counting both notes.
- In the example of C and E, there are three letter names: C, D, E.

3. Determine the quality of the interval by comparing to the major scale.
- For example, in the major scale from C to E, the third note is E, making it a major third.

By following these steps, you can easily determine the specific harmonic interval between two simultaneous notes.