Percussionist Emil Richards was a part of the Abnuceals Emuukha Electric Symphony Orchestra (Feb - March 1967) when Frank Zappa recorded the orchestral parts for "Lumpy Gravy". In the late seventies Emil took part in recordings that can be found on various Zappa albums.
In 1967, Emil Richards recorded "New Time Element", an album that also included 'Happy Together'.
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-- info: Jan van Kemenade