Via Wikipedia:
The Carnival of the Animals (French: Le Carnaval des animaux) is a humorous musical suite of fourteen movements, including "The Swan", by the French composer Camille Saint-Saëns. The work, about 25 minutes in duration, was written for private performance by two pianos and chamber ensemble; Saint-Saëns prohibited public performance of the work during his lifetime, feeling that its frivolity would damage his standing as a serious composer.