Conversation so far:
When did Duke Ellington die?
Duke Ellington died on May 24, 1974.
What was something significant that happened in Duke Ellington's last years?
In 1999, Duke Ellington was posthumously awarded a special Pulitzer Prize commemorating the centennial year of his birth, in recognition of his musical genius.

Question: What recordings did he make?
Self-contained rewrite: What recordings did Duke Ellington make?