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| Arturo Toscanini with granddaughter Sonia (her parents were Wanda Toscanini and Vladimir Horowitz) |
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| NZZ, 22 September 1938, advert for concert of 26 September 1938 - Horowitz played a programme of Chopin pieces, the Busch quartet w/guests the first string quintet by Mendelssohn for starters, and Schubert's string quintet after Horowitz' middle section |
