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http://en.wikipedia.org/wiki/Extended_technique

Extended techniques

Extended technique is a term used in music to describe unconventional, unorthodox, or non-traditional methods of singing or of playing musical instruments employed to obtain unusual sounds or timbres . [ 1 ] Composers’ use of extended techniques is not specific to contemporary music (for instance, Hector Berlioz ’s use of col legno in his Symphonie Fantastique is an extended technique) and it transcends compositional schools and styles.