Although ‘progressive rock’ remains a smug oxymoron, Yes were the least aggravating of all the snots who smarmed their way across the music firmament from the late-1960s onward. This was their third, the 1971 set that proved to be a massive breakthrough, setting the stage for their masterpiece, Fragile. It’s all here: virtuoso playing, airy harmonies, the sub-Tolkien/post-2001 mystical mumbo-jumbo. To play a track called ‘Starship Trooper’ with a straight face… who am I to deem a few million fans devoid of taste? But if my remarks on prog-rock seem harsh, never forget that we have to thank it for this: the backlash to the genre was punk.

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