Music Composition For Dummies
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The distance between two musical pitches is called an interval. Intervals are important to music because they build scales and chords. In other words, music gets its richness from intervals. Composers and musicians use two types of intervals: harmonic and melodic intervals.

  • You get a harmonic interval when you play two notes at the same time.

  • You get a melodic interval when you play two notes separately in time, one after the other.

The identity of both harmonic and melodic intervals is determined by two things:

  • Quantity: You determine an interval's quantity by simply adding the lines and spaces included in the interval on the music staff. Accidentals (sharps and flats), which raise or lower a pitch by a half step, don't matter when counting interval quantity. Interval quantity may be

    • Unison (or prime)

    • Second

    • Third

    • Fourth

    • Fifth

    • Sixth

    • Seventh

    • Octave

  • Quality: Interval quality is based on the number of half steps from one note to another. Unlike in interval quantity, accidentals do matter in interval quality. The terms used to describe quality, and their abbreviations, are as follows:

    • Major (M): Contains two half steps between notes

    • Minor (m): Contains a half step less than a major interval, or one half step between notes

    • Perfect (P): Refers to the harmonic quality of primes, octaves, fourths, and fifths

    • Diminished (dim): Contains a half step less than a minor or perfect interval

    • Augmented (aug): Contains a half step more than a major or perfect interval

About This Article

This article is from the book:

About the book authors:

Scott Jarrett is a producer and musician who currently runsthe Monkey House Recording Studio. Holly Day is the coauthor of Music Theory For Dummies and Music Composition For Dummies. Her articles have appeared in publications across the globe.

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