Unison is considered a harmonic interval, just like a fifth or a third.

Canons at small harmonic intervals usually necessitate considerable voice crossing, and in a crab canon it is inevitable at the midpoint.

Dissonant harmonic intervals included:

When they occur simultaneously, they may be regarded as forming a harmonic interval.

The eight-holed flute can play "all harmonic intervals and two registers."

These harmonic intervals are said to be a "function of culture" and were of a larger set compared to that now familiar in the West.

A 5-note scale has 10 of these harmonic intervals, a 6-note scale has 15, a 7-note scale has 21, an 8-note chord has 28.

Musicians commonly use interference beats to objectively check tuning at the unison, perfect fifth, or other simple harmonic intervals.

Each has its favorite melodic and harmonic intervals (though not themes in the Classical sense), its own rhythmic fingerprints.

The interval between Earth and the fixed stars being the most perfect harmonic interval.