Tchaikovsky and Rimsky-Korsakov didn’t like each other and agreed on very few things, but they were of one opinion on this: you had to write constantly. If you can’t write a major work, write minor trifles. If you can’t write at all, orchestrate something.
Volkov, Solomon, tr. Antonina W. Bouis, Testimony: The memoirs of Dmitri Shostakovich (New York: Harper & Row, 1979), p. 218