Sympathetic Vibratory Physics - It's a Musical Universe!
 
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INTERVAL, AS COMBINATION

Text: An interval is a combination of two tones. It is also the distance between or the difference between two tones. When these two tones are sounded together the result is an harmonic interval, and when they are sounded one after the other the result is a melodic interval. The quality of an interval is determined by its size and by the relationship of its position to the keynote. There are five types of intervals: major (indicated by M), minor (m), perfect (P), diminished (dim.), and augmented (Aug.). A major interval contracted - by lowering the upper note or raising the lower note - by one half step becomes minor, and contracted by another half step becomes diminished. A perfect interval contracted by a half step becomes diminished, and contracted by another half step (not usually practical), becomes doubly diminished. A perfect or a major interval expanded by a half step becomes augmented.

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Source: 13

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