Also sprach Zarathustra, Op. 30 (Thus Spoke Zarathustra or Thus Spake Zarathustra) is a tone poem by Richard Strauss, composed during 1896 and inspired by Friedrich Nietzsche's philosophical treatise of the same name. The composer conducted its first performance on 27 November 1896 in Frankfurt. A typical performance lasts half an hour.
The work has been part of the classical repertoire since its first performance during 1896. The initial fanfare – entitled "Sunrise" in the composer's program notes – became particularly well known to the general public due to its use in Stanley Kubrick's 1968 film 2001: A Space Odyssey. The fanfare has also been used in numerous other media productions.