Austrian pianist Till Fellner is in Chicago this week to perform Mozart’s Piano Concerto no. 22 with the Orchestra under the baton of Bernard Haitink. And in between rehearsals, he visited the Rosenthal Archives to do a little research on his great-grandfather’s brother’s son—that would be his first cousin twice removed—Hugo Kortschak, who was a former violinist and assistant concertmaster of the Chicago Symphony Orchestra!

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