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A chordioid, also called ''chord fragment'' or ''fragmentary voicing''〔Rawlins, Robert, et al. (2005) ''Jazzology: The Encyclopedia of Jazz Theory for All Musicians'', pg. 86. Winona: Hal Leonard. ISBN 0634086782.〕 or ''partial voicing'',〔 is a group of musical notes which does not qualify as a chord under some preferred chord theory or other, but still useful to name and reify for other reasons. The main use of chordioids is to form "legitimate" chords enharmonically in 12TET by adding one or more notes to this base.〔Slonimsky, Nicholas. (1947) ''Thesaurus of Scales and Melodic Patterns'', pg. v. New York: Charles Scribner Sons. ISBN 002-6118505.〕 It is typical of chordioids that many different resultant chords can be created from the same base depending on the note or combination of notes added.〔 The resultant chords on a single chordioid are somewhat related, because they can be progressed between using motion of just one voice. Theorists – or practical music teachers – writing of chordioids usually go so far as to advise that students learn them in the practical manner of chords generally: in all transpositions, ranges, permutations, and voicings, for reading, writing, and playing〔〔〔Slonimsky, Nicholas. (1947) ''Thesaurus of Scales and Melodic Patterns'', pg. 241. New York: Charles Scribner Sons. ISBN 002-6118505.〕 It is the case, also, that "legitimate chords" can be used as chordioids to create resultant chords by the same process.〔Schillinger, Joseph. (1941) ''The Schillinger System of Musical Composition, Vol. 1'', pg. 478. New York: Carl Fischer. ISBN 0306775212〕 Perhaps this is whence the non-chord chordioids come. The Italian augmented 6th chord (It+6) is one example, from which proceed the French augmented 6th chord (Fr+6) and German augmented 6th chord (Gr+6) by addition of one note. Rawlins(2005) asserts that the notion derives from practice of such composers as Eric Satie, Claude Debussy, Maurice Ravel, and Gabriel Faure, and was first used in jazz by Bill Evans.〔 Two chordioids may potentially be combined, as well. Typically, duplication of notes will result in a reduced number of unique notes in the resultant. Chordioids as a technique is related to polychords insofar as polychords are the result of an additive process, but differs in that the basis of polychords is the addition of two known chords. Chordioids is related also to upper structures as a technique insofar as upper structures represent groups of notes not commonly taken to be "legitimate" chords, but differs in that chordioids as a technique uses ''a priori'' structures held in common rather than a free selection of color tones appropriate for a lower integral chord. Chordioids is related to slash chords as a technique insofar as known chords may be used as chordioids to create resultant scales, but differs in that chordioids used are not exclusively known chords. == Master Chord / Dominant 7 Chordioid == Nicolas Slonimsky named "master chord"〔 that chordioid described in jazz chord theory as 7no5, e.g.: . The sonority of the chordioid itself is identical to that of the It+6, a subset of the Wholetone scale and so subject to some of the symmetries and homogeneity for which that scale is known, and anhemitonic allowing the possibility that the resultant scale be anhemitonic or at least ancohemitonic itself. The chord buttons of the Accordion usually play master chords, allowing the bass buttons (or a second chord button) to supply the variable note (or notes) to complete the sonority. The new name and concept, "master chord", thus does not imply either jazz derivation, completeness of the sonority as an independent chord, nor connection to other use as a chord of dominant function. It does not speciously denote anything to be "missing", or posit that the listener should ever hear a note not actually present. It rejects the tertian chordal basis as pertaining at all. These, the practicality of application, and the variety of use, are the logical basis of chordioids. The following table shows the resultant chord for some of the possible added notes: 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「Chordioid」の詳細全文を読む スポンサード リンク
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