The best old music we discovered this year

Strange folk, lost pop, disco oddities and, um, Dido – here are the forgotten tracks that became this year’s most replayed revelations
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I grew up listening to the Mamas and the Papas’ hits but had never heard their albums before this year. I had no idea anything as creepy as Mansions lurked within their sunny oeuvre. Its sound is ominous, its mood one of stoned paranoia, its subject rich hippies sequestered in the titular luxury homes, haunted by the sensation that the flower-power dream is going wrong.