The most important moment in Balkanska's career came with the folk song "Izlel je Delyo hajdutin", which she recorded together with the bagpiper Dimitar Petkovski. In 1972 it became part of the Voyager Golden Record, a collection of songs, sounds and images from our planet, which also contains works of famous composers such as Mozart, Bach, Beethoven, and Stravinsky. NASA put copies of the record in the "Voyager 1" and "Voyager 2" space probes and launched them on August 20, 1977. According to Carl Sagan, one of the creators of the Voyager Golden Record, only advanced alien civilizations would be able to play it. 