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From Wikipedia.com(full Wiki link):
https://www.facebook.com/pg/trevorhornofficial
https://en.wikipedia.org/wiki/Drama_(Yes_album)
https://www.ebay.com/e/_electronics/show-your-melody-music-equipment?mkcid=1&mkrid=711-53200-19255-0&siteid=0&campid=5339058066&toolid=20014&customid=&mkevt=1