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In the process, we've tested sections of the work on audiences and have gradually reached the conclusion that almost any distraction will reduce the intelligibility of sung words: an unfamiliar verbal image, a wide melodic interval, any sort of sound heard in counterpoint.

Listen to 'Orfeo,' " wrote Shaw, "and you hear the perfect union of the poem and the music — that growth of every musical form, melodic interval, harmonic progression, and orchestral tone out of some feeling or purpose belonging to the drama ...

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

A Melodic interval is the difference in pitch between two tones sounded in succession by the same voice.