The Original New Timbral Orchestra (TONTO) is the first and largest multitimbral polyphonic analog synthesizer, capable of producing many tone colours with different voices simultaneously.
Beginning with a single Moog Series III Modular in 1968, creators Malcolm Cecil and Robert Margouleff continued to expand TONTO with modules from different manufacturers, along with custom additions designed by Cecil. It marked the first attempt at creating a universal language for different synthesizers to communicate with each other, which was revolutionary.
Stevie Wonder, I believe was the first to really use this in popular music, as first appeared on his record Talking Book, and is on many hits, including Superstition.
Pictures are from electronics designer Drew Schlesinger and Google arts and culture
