<prompt> Pedzisa mutsara unotevera: Rostropovich akaridza paThe Proms usiku hwaAugust 21, 1968. Akaridza neSoviet State Symphony Orchestra kwaiva kutamba kwokutanga kweorchestra paProms. Purogiramu yacho yakaratidza muumbi weCzech Antonín Dvořáks Cello Concerto in B minor uye yakaitika pazuva rimwe chetero iro Chibvumirano cheWarsaw  <response>: vakapinda muCzechoslovakia kuti vapedze Prague Spring yaAlexander Dubček. Pashure pokuratidzira, uko kwakanga kwatangirwa nokunyombwa nokuratidzira, boka ravaimbi nomuridzi wemba vakakwaziswa navateereri veProms. Rostropovich akamira ndokusimudza nziyo dzaDvořák dzomutungamiriri wacho sechiratidzo chokubatana nenyika yomunyori uye guta rePrague. 