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In C
''In C'' is a musical piece composed by Terry Riley in 1964 for an indefinite number of performers. He suggests "a group of about 35 is desired if possible but smaller or larger groups will work".〔Riley, Terry, "''In C'': Performing Directions", from the score for ''In C'', 1989, Celestial Harmonies〕 A series of short melodic fragments, ''In C'' is a response to the abstract academic serialist techniques devised by Schoenberg that dominated Western university composers for many decades〔"The style (Riley at the time ) was an outgrowth - and in many ways a rebellion against - the dominant modern classical sounds of the 20th Century up to the 1960's. Sometimes called serialism..." http://www.ambientmusicguide.com/pages/R/rileyTerry.php〕 and is often cited as the first minimalist composition (though La Monte Young's drone compositions preceded it by several years, ''In C'' had a greater impact on public consciousness).〔Christopher Bonds, ''The Musical Impulse'', second, revised edition (Dubuque, Iowa: Kendall Hunt Publishing Company, 1994): 345. ISBN 9780840398024〕
== Technique ==
''In C'' consists of 53 short, numbered musical phrases, lasting from half a beat to 32 beats; each phrase may be repeated an arbitrary number of times. Each musician has control over which phrase they play: players are encouraged to play the phrases starting at different times, even if they are playing the same phrase. In this way, although the melodic content of each part is predetermined, ''In C'' has elements of aleatoric music to it.〔"''In C'' – probably the second-best-known aleatory classic – is less a score than a set of instructions" http://www.ft.com/cms/s/2/8959b73a-2f30-11e3-ae87-00144feab7de.html#axzz38lf7q1Lq〕 The performance directions state that the musical ensemble should try to stay within two to three phrases of each other. The phrases must be played in order, although some may be skipped. As detailed in some editions of the score, it is customary for one musician ("traditionally... a beautiful girl," Riley notes in the score)〔This direction seems to be in the original score, but is not in the OtherMinds CC-licensed score.〕 to play the note C in repeated eighth notes, typically on a piano or pitched-percussion instrument (e.g. marimba). This functions as a metronome and is referred to as "The Pulse". Steve Reich introduced the idea of a rhythmic pulse to Riley, who accepted it, thus radically altering the original composition by Riley which had no rhythm.〔Steve Reich - rhythm and minimalism" https://www.youtube.com/watch?v=pFS8Ru27rqs?t=12m22s〕
''In C'' has no set duration; performances can last as little as fifteen minutes or as long as several hours, although Riley indicates "performances normally average between 45 minutes and an hour and a half." The number of performers may also vary between any two performances. The original recording of the piece was created by 11 musicians (although, through overdubbing, several dozen instruments were utilized), while a performance in 2006 at the Walt Disney Concert Hall featured 124 musicians.
The piece begins on a C major chord (patterns one through seven) with a strong emphasis on the mediant E and the entrance of the note F which begins a series of slow progressions to other chords suggesting a few subtle and ambiguous changes of key, the last pattern being an alteration between B♭ and G. Though the polyphonic interplay of the various patterns against each other and themselves at different rhythmic displacements is of primary interest, the piece may be considered heterophonic.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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