<prompt> Qedela umusho olandelayo: URostropovich wadlala eThe Proms ngobusuku bango-August 21, 1968. Wayedlala neSoviet State Symphony Orchestra kwakuwukuqala kwe-orchestra emdlalweni weProms. Lolu hlelo lwalune-Cello Concerto in B minor yomqambi waseCzech u-Antonín Dvořák futhi lwenzeka ngosuku olufanayo neSivumelwano SaseWarsaw  <response>: yahlasela iCzechoslovakia ukuze iqede u-Alexander Dubčeks Prague Spring. Ngemva komdlalo, owawandulelwe ukuphazamiseka nemiboniso, iqembu lomculo wezinsimbi nomculi bebodwa bashaywa ihlombe izilaleli zeProm. URostropovich wasukuma waphakamisa umculo kaDvořák owawuqoshiwe njengophawu lokubambisana nezwe lakubo lomqambi nedolobha lasePrague. 