Jon Anderson - Sound Out the Galleon from the Vinyl LP Olias of Sunhollow.
Writing in RAM in July 1976, Bob Edmunds described the album as being "as impressive as anything Yes have produced collectively... Musicians with greater skills (e.g. Mike Oldfield) have created instrumental works on this scale but have always been denied access to the wonderful instrument of Jon Anderson's voice.

I loved this: RCA Records informed Vangelis, a composer and keyboardist signed to the label at the time, of their dissatisfaction that he had played on Olias of Sunhillow without informing them. Vangelis denied any involvement on the album despite RCA having thought the keyboards on the album were performed in his style. Vangelis said: "I myself was very surprised it had my name on the thank you-list. Maybe I have influenced Jon, I don't know. And it's clear that it's closer to this than you get with Yes. But maybe it's a coincidence. In any case, it's a formidable feat there is such a record when it features like Jon a debutante on keyboards. I believe the record represents more the way he is than what he does with Yes, no offense intended [...] Anderson is not an instrumentalist in the old sense of the term and yet he has made, with lots of effort, a marvellous record.
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https://www.youtube.com/watch?v=i7DwBkzbPBo