Funnily enough, one of them is Tchaikovsky's Seventh. But not that Tchaikovsky's Seventh, whose context establishes it as not a hoax, but an imaginary "news report from the future."
What the futurologist didn't know is that Tchaikovsky drafted and abandoned a Symphony in E-flat just before writing the Pathetique (his Sixth), and that in 1956 a musicologist cleaned up and orchestrated the drafts and called it the Seventh. You can find a recording of it (and of the Third Piano Concerto, which Tchaikovsky assembled from some of the same draft material) here.
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What the futurologist didn't know is that Tchaikovsky drafted and abandoned a Symphony in E-flat just before writing the Pathetique (his Sixth), and that in 1956 a musicologist cleaned up and orchestrated the drafts and called it the Seventh. You can find a recording of it (and of the Third Piano Concerto, which Tchaikovsky assembled from some of the same draft material) here.