Question: Oleg Moiseyevich Kagan collaborated with which Soviet pianist who died August 1, 1997?
Sentence (from "Sviatoslav Richter"): Sviatoslav Teofilovich Richter (Russian: Святосла́в Теофи́лович Ри́хтер , "Sviatosláv Teofílovich Ríkhter"; ] ; March 20 [O.S. March 7] 1915 – August 1, 1997) was a Soviet pianist known for the depth of his interpretations, virtuoso technique, and vast repertoire.
Relevant evidence: Yes