Did you know that a deadly anti-Semitic riot involving approximately 10,000 people erupted in Warsaw in 1922 in response to a planned concert of Yiddish song by soprano Isa Kremer ? (See discussions regarding this hook at Talk:Isa Kremer and at Wikipedia talk:WikiProject Poland/Archive 7#Did you know? 18:00, 13 October 2010 (UTC) , as well as at WT:DYK#Printing corrections and apologies .)