Close to the edge (1972) remains an untarnished pinnacle of ’70s tech-flash, its mammoth title track beginning with a ferocious flourish to rival the most adventurous of post-hardcore ensembles before introducing elements of cosmic funk, Beach Boys harmony and monolithic organ grandeur. Its much-derided 1974 double-disc follow-up Tales Of Topographic Oceans remains a real curate’s egg. “The Revealing Science Of God” is sublime, but the album as a whole lacks the tight structure and focus of its predecessor. Then 1974’s Relayer saw drummer Alan White and Swiss-born keyboardist Patrick Moraz replace the disillusioned Bill Bruford and Rick Wakeman. Moraz introduced a hefty dose of fusion, but by 1977’s Going For The One Wakeman was back on board and a more concise Yes emerged, reining their excesses into a sporadically engaging Euro-rock best illustrated by Jon Anderson’s joyful and triumphant “Wonderous Stories”.