According to Sutherland (1994) live electronic music generally utilizes instrumental or electronic sounds but excludes those that have been prerecorded. The timbres of the various sounds may then be transformed extensively during performance using devices such as amplifiers, filters, ring modulators and other forms of circuitry. The electronic processing determines both the fine musical detail, such as variations in timbre arising from any electronic processing, and the overall macro structure of a work as it is executed live. Sutherland also notes that there are exceptions for example Karlheinz Stockhausens Mikrophone I.
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