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(FILES) Argentine pianist Martha Argerich (R) and pianist and conductor Daniel Barenboim (L) greet the public during a free concert at Plaza Vaticano square in Buenos Aires on July 29, 2017. Celebrated Argentina-born pianist Martha Argerich has cancelled concerts in Germany and Switzerland in the coming days due to illness, organisers of the shows said on August 9, 2023. (Photo by ALEJANDRO PAGNI / AFP) (KEYSTONE/AFP/ALEJANDRO PAGNI)