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allmusic.com...

With the release of 1967's Days of Future Passed, the Moody Blues left behind their R&B origins and emerged as pioneers of Britain's emerging art rock sound. A richly imagined concept album that fused classical music with rock, Days of Future Passed arrived less than six months after the Beatles' Sgt. Pepper's Lonely Hearts Club Band to an audience already primed to embrace such a progressive work. What's more, it was a hit on both sides of the Atlantic thanks to its dreamy singles "Nights in White Satin" and "Tuesday Afternoon," establishing the Moodies as both a commercially viable and deeply creative unit.