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''The Well-Tempered Clavier'' (),〔In the German of Bach's time the ''Clavier'' was a generic name meaning "keyboard instrument," most typically the harpsichord or clavichord – but not excluding the organ, either. Bach's Clavier compositions are now usually played on the piano or harpsichord. The modern German spelling is '.〕 BWV 846–893, is a collection of solo keyboard music composed by Johann Sebastian Bach. He gave the title to a book of preludes and fugues in all 24 major and minor keys, dated 1722, composed "for the profit and use of musical youth desirous of learning, and especially for the pastime of those already skilled in this study". Bach later compiled a second book of the same kind, dated 1742, with the title ''Twenty-four Preludes and Fugues''. The two works are now considered to make up a single work, ''The Well-Tempered Clavier'', or "the 48", and are referred to as ''The Well-Tempered Clavier, Book I'' and ''The Well-Tempered Clavier, Book II'', respectively. This collection is generally regarded as being among the most influential works in the history of Western classical music.〔 ==Composition history== The first set was compiled in 1722 during Bach's appointment in Köthen; the second followed 20 years later in 1742 while he was in Leipzig. Both were widely circulated in manuscript, but printed copies were not made until 1801, by three publishers almost simultaneously in Bonn, Leipzig and Zurich.〔 〕 Bach's style went out of favour in the time around his death, and most music in the early Classical period had neither contrapuntal complexity nor a great variety of keys. But, with the maturing of the Classical style in the 1770s, the ''Well-Tempered Clavier'' began to influence the course of musical history, with Haydn and Mozart studying the work closely. Each set contains twenty-four pairs of preludes and fugues. The first pair is in C major, the second in C minor, the third in C-sharp major, the fourth in C-sharp minor, and so on. The rising chromatic pattern continues until every key has been represented, finishing with a B-minor fugue. Bach recycled some of the preludes and fugues from earlier sources: the 1720 ''Klavierbüchlein für Wilhelm Friedemann Bach'', for instance, contains versions of eleven of the preludes. The C-sharp major prelude and fugue in book one was originally in C major – Bach added a key signature of seven sharps and adjusted some accidentals to convert it to the required key. The far-reaching influence of Bach's music is evident in that the fugue subject in Mozart's Prelude and Fugue in C major, K. 394, is similar in structure to that of the A-flat major Fugue in Book II of the ''Well-Tempered Clavier''. This pattern is also found in the C major fugue subject of Book II. Another similar theme is the third movement fugue subject in the Concerto for Two Harpsichords, BWV 1061. Bach's title suggests that he had written for a (12-note) well-tempered tuning system in which all keys sounded in tune (also known as "circular temperament"). The opposing system in Bach's day was meantone temperament in which keys with many accidentals sound out of tune. (See also musical tuning). It is sometimes assumed that Bach intended equal temperament, the standard modern keyboard tuning which became popular after Bach's death, but modern scholars suggest instead a form of well temperament. There is debate whether Bach meant a range of similar temperaments, perhaps even altered slightly in practice from piece to piece, or a single specific "well-tempered" solution for all purposes. 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「The Well-Tempered Clavier」の詳細全文を読む スポンサード リンク
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