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Among alternative tunings for guitar, a major-thirds tuning is a regular tuning in which each interval between successive open strings is a major third ("M3" in musical abbreviation). Other names for major-thirds tuning include major-third tuning, M3 tuning, all-thirds tuning, and augmented tuning. By definition, a major-third interval separates two notes that differ by exactly four semitones (one-third of the twelve-note octave). The Spanish guitar's tuning mixes four perfect fourths (five semitones) and one major-third, the latter occurring between the G and B strings: :E-A-D-''G''-''B''-E. This tuning, which is used for acoustic and electric guitars, is called "''standard''" in English, a convention that is followed in this article. While standard tuning is irregular, mixing four fourths and one major third, M3 tunings are regular: Only major-third intervals occur between the successive strings of the M3 tunings, for example, the open augmented C tuning :G-C-E-G-C-E. For each M3 tuning, the open strings form an augmented triad in two octaves. For guitars with six strings, every major-third tuning repeats its three open-notes in two octaves, so providing many options for fingering chords. By repeating open-string notes and by having uniform intervals between strings, major-thirds tuning simplifies learning by beginners. These features also facilitate advanced guitarists' improvisation,〔 precisely the aim of jazz guitarist Ralph Patt when he began popularizing major-thirds tuning between 1963 and 1964. ==Avoiding standard tuning's irregular intervals== In standard tuning, the successive open-strings mix two types of intervals, four perfect-fourths and the major third between the G and B strings: :E-A-D-''G''-''B''-E. Only major thirds occur as open-string intervals for major-thirds tuning, which is also called "''major-third'' tuning",〔〔 "''all-thirds'' tuning",〔 and "''M3'' tuning".〔 A popular M3 tuning has the open strings :G-C-E-G-C-E,〔〔 in which the low G is a major third above the low E of standard tuning. Consequently, a seventh string for the low E is often added to restore the standard E-E range.〔〔 While M3 tuning can use standard sets of guitar strings, specialized string gauges have been recommended. Besides this M3 tuning, which has the open notes ,〔 there are exactly three other M3 tunings, which have distinct sets of open-note pitch classes. The other major-thirds tunings respectively have the open notes ,〔 ,〔 and .〔 For six-string guitars, the M3 tuning :F-A-D-F-A-D loses the two lowest semitones on the low-E string and the two highest semitones from the high-E string in standard tuning; it can use string sets for standard tuning.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Major thirds tuning」の詳細全文を読む スポンサード リンク
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