Perhaps she’d learned them in the early days after the war, when she’d performed with Holocaust survivors at a hospital in 1945. Jansen does not appear in Jeremy Eichler’s new book, “Time’s Echo,” but the impulse to turn to music during and after the Holocaust is at the heart of it. Eichler, The Boston Globe’s chief classical music critic, suggests that music can help us remember what we’ve lost. “Time’s Echo” is an engrossing recovery project that reveals the depths of Europe’s ability — and inability — to mourn those losses. Not only do we remember music but, just as importantly, “music also remembers us,” Eichler argues.

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Persons: Jeremy Eichler, Fasia Jansen, Brecht, she’d, Jansen, Jeremy Eichler’s, Eichler, we’ve, —, Richard Strauss’s “, ” Arnold Schoenberg’s “, ” Benjamin Britten’s “, ”, Dmitri Shostakovich’s “ Babi Yar, ” Eichler, “, ” Schoenberg Organizations: The Boston, Central Locations: German, Hamburg, Neuengamme, Warsaw, Europe