Malzberg, Barry N. "Andante Lugubre"
Divergence: 1893 CE
What if: Tchaikovsky lived much, much longer than 53 years and eventually emigrated to Hollywood.
Summary: At age 99, Tchaikovsky attends a meeting of Jewish composers protesting Hitler's policies.
Published: In Science Fiction Age, May 1993; and In the Stone House, q.v.