Why did The International sound from the Moon 57 years ago?

MADRID 31 (EUROPE PRESS)

The space race between Russians and Americans has among its anecdotes the interpretation of The International, by a Soviet spacecraft from lunar orbit57 years ago now.

The Soviet Union launched its Luna 10 unmanned spacecraft on March 31, 1966. For the first time in the space age, the probe was successfully placed in lunar orbit on April 4.

The spacecraft carried a set of solid-state oscillators that were programmed to reproduce the notes of The Internationale, and broadcast live to the 23rd Congress of the Communist Party of the Soviet Union (CPSU), gathered those days.

During a rehearsal on the night of April 3, the playback went well, but the next morning, controllers discovered a missing note and played the tape from the night before during the session of Congress, claiming it was a live broadcast from the Moon.

Luna 10 was powered by batteries and operated for 460 lunar orbits and 219 radio data transmissions, until May 30, 1966. reports Wikipedia.

The scientific instruments consisted of a gamma-ray spectrometer for the energy range 0.3 to 3 MeV, a triaxial magnetometer, a meteorite detector, instruments for studying solar plasma and infrared emissions from the Moon and also radiation in the cislunar environment. He also conducted gravitational studies.

The Luna or Lunik program was made up of a series of Soviet automatic probes developed by the scientist Sergei Korolev, dedicated to photographing and studying the surface of our satellite, the Moon.

The program was made up of 24 units, launched between January 2, 1959 and August 9, 1976, some of which returned to our planet with lunar soil samples.