Yo Yo Ma and his fellow performers gave a moving performance of the Ukrainian national anthem before their concert at the Kennedy Center. You can hear it at
https://www.huffpost.com/entry/yo-yo-ma-ukraine-national-anthem_n_622703e5e4b004e4e384fd3c
https://www.huffpost.com/entry/yo-yo-ma-ukraine-national-anthem_n_622703e5e4b004e4e384fd3c