Question: The Lockenhaus Chamber Music Festival has included performances by the solo pianist who has held what country's citizenship since 1972?
Sentence (from "Vladimir Ashkenazy"): Vladimir Davidovich Ashkenazy (Russian: Влади́мир Дави́дович Ашкена́зи , "Vladimir Davidovich Ashkenazi"; born 6 July 1937) is an internationally recognized solo pianist, chamber music performer, and conductor.
Relevant evidence: Yes