“Døber, sanger, knægte, flammer” in the Højskolesangbog
The song is nr. 337 in the 19th edition of the Højskolesangbog and can be found under “Året – Midsommer”.
The melody is made by Mette Kathrine Stærk Jensen, and Martin Rauff-Nielsen has written the text.
Read more about the song here. (in Danish)