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interval, in music, the difference in pitch between two tones. Intervals may be measured acoustically in terms of their vibration numbers. They are more generally named according to the number of steps they contain in the diatonic scale of the piano; e.g., from C to D is a second, C and D being the first two notes of the scale of C. The fourth, fifth, and octave are termed perfect intervals as they have a characteristic sonority quite unlike any other interval. An interval between two natural notes, neither note being a sharp or a flat, is a major interval; if it is reduced by a semitone, it becomes minor. If a perfect or a minor interval is made half a step smaller it is called diminished, and when half a step larger, augmented. An interval may also be expressed by means of the ratio of the frequencies of its two tones. For example, the octave may be expressed by the ratio 2:1 because its upper tone has a frequency twice that of its lower tone.

The Columbia Electronic Encyclopedia Copyright © 2004.

Licensed from Columbia University Press

Licensed from Columbia University Press

Interval may refer to:

- Interval (mathematics), a range of numbers (formally, a subset of an ordered set)
- Interval measurements or interval variables in statistics is a level of measurement
- Interval (music), the relationship between two notes
- Interval (time), the duration between two events
- Space-time interval, the distance between two points in 4-space
- Playing time (cricket)
- A synonym (especially UK usage) for an intermission in theatre
- Interval training, in sports, is a training technique often used by runners
- Interval Research Corporation, a defunct technology think tank founded by Paul Allen.

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Last updated on Wednesday September 03, 2008 at 09:51:07 PDT (GMT -0700)

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This article is licensed under the GNU Free Documentation License.

Last updated on Wednesday September 03, 2008 at 09:51:07 PDT (GMT -0700)

View this article at Wikipedia.org - Edit this article at Wikipedia.org - Donate to the Wikimedia Foundation

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