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Daniel Barenboim returns to the Proms, this time as both conductor and soloist, taking the piano part in Beethoven’s Triple Concerto. Schoenberg’s Chamber Symphony startled audiences with its ruthless concision – a reaction against the excesses of the late-Romantics. But excess gets the last word, in Tchaikovsky’s Fourth Symphony, the musical expression of some of its composer’s most-troubled and heartfelt emotions.