In classical music from Western culture, a third is a musical interval encompassing three staff positions (see Interval number for more details), and the major third (Play) is a third spanning four semitones. Along with the minor third, the major third is one of two commonly occurring thirds. It is qualified as major because it is the larger of th...
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http://en.wikipedia.org/wiki/Major_third
In music, a major third is a third of two steps.
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http://www.probertencyclopaedia.com/browse/VM.HTM
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