@troux, @Lugia
Decidedly, since the bids rise easily here, I will claim in my turn that, in the Western world, the 'drone' was born with the plainsong, in the sacred music, in the Middle Ages. And that it finds its own roots in the psalms of the synagogues, then at the birth of the Christian era. This spiritual or mystical 'sap' is the very essence of 'drone': from the origins to our days (cf. Radigue, La Monte, etc.).
It is a sacred music, not profane.
Who says better ? :)
Brahma, Vishnu and Shiva ?
Not so bad... :))

'On ne devrait jamais quitter Montauban' (Fernand Naudin).