Tonto's Expanding Head Band was an electronic music duo consisting of Malcolm Cecil and Robert Margouleff. Despite releasing only two albums in the early 1970s, the duo were (and still remain) hugely influential because of their voluminous session work for other musicians (most notably Stevie Wonder), extensive commercial advertising work and the unique warmth and personality of their work. Tonto is an acronym for "The Original New Timbral Orchestra," the world's first (and still the largest) multitimbral polyphonic analog synthesizer, designed and constructed by Malcolm Cecil.

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