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''Black Angels'' (Edition Peters, New York, no. 66304, copyright 1971), subtitled "Thirteen Images from the Dark Land", is a work for "electric string quartet" by the American avant-garde composer George Crumb. It was composed over the course of a year and is dated "Friday the Thirteenth, March 1970 (in tempore belli)" as written on the score. Crumb is very interested in numerology and numerically structured the piece around 13 and 7. The piece is notable for its unconventional instrumentation, which calls for electric string instruments, crystal glasses, and two suspended tam-tam gongs. ==Instrumentation== ''Black Angels'' is primarily written for (in Crumb's words) "electric string quartet." Though generally played by amplified acoustic instruments, the work is occasionally performed on specially constructed electronic string instruments. The music uses the extremes of the instruments' registers as well as extended techniques such as bowing on the fingerboard above the fingers and tapping the strings with thimbles. At certain points in the music, the players are even required to make sounds with their mouths and to speak. Each of the string players is also assigned a set of instruments to play throughout the piece. Some of the equipment requires specific preparation, such as the crystal glasses, which are tuned with different amounts of water. Violin 1 * maraca * 7 crystal glasses * 6" glass rod * 2 metal thimbles * metal pick (paper clip) Violin 2 * 15" suspended tam-tam and mallet * contrabass bow (for use on tam-tam) * 7 crystal glasses * 6" glass rod * 2 metal thimbles * metal pick (paper clip) Viola * 6 crystal glasses * 6" glass rod * 2 metal thimbles * metal pick Cello * maraca * 24" suspended tam-tam, soft and hard mallets * contrabass bow 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「Black Angels (Crumb)」の詳細全文を読む スポンサード リンク
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