Disco was brand new then and there were a few jocks that had monstrous sound systems but they wouldn't dare play this kind of music. They would never play a record where only two minutes of the song was all it was worth. They wouldn't buy those types of records.
No one can live entirely on their own, nor can any country or society exist in isolation.
I probably went to musique concrete concerts - though not the very first ones - at the beginning of the 50s.