In 1977, NASA sent the spacecraft Voyager 1 and 2 in the universe on a mission in outer space in search of clues and signs of intelligent life. With them on board, they had a CD for playback in the event that they were to encounter intelligent life out there in eternity. This CD, The Golden Record, contained different fragments of sound here from the ground, for example, the sound of a creaking carriage, children greeting in languages f the world, the sound of thunder and the sound of the finest man-made music, including a Bulgarian folk song.
The Voyager spacecraft recorded the interaction between the solar wind and the magnetosphere of other planets and moons in our solar system, and NASA has converted these vibrations into sounds that are within the human spectrum. This makes it possible to hear the heavenly distinct tones.
The concert in Koncertkirken in Copenhagen, created by Thomas Agergaard and performed by himself and the choir Usmifka, is a meeting between the Bulgarian sounds and voices from space.