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If the two tones are sounded simultaneously the result is an harmonic interval, but if sounded consecutively the result is a melodic interval.

An Harmonic interval is the difference in pitch between two tones sounding at the same time.

No one can play the eternal comfort and blessing of tone and sound, its magic correlation with the eager, straining ear; so that"—he continued in a lower voice and blushing with confusion—"so that the third tone forms a harmonic interval with the first, as does the fifth, and the leading tone rises like a fulfilled hope, while the dissonance is bowed down like conscious wickedness or arrogant pride.