The music is playing but who can hear it?!

HH in the story from ancient times, of a king's son and a maid's son who were exchanged, only after the man of the forest revealed to them that the day laughs at the night etc. only afterwards they discerned that the beasts roaring and screaming at night were in actuality producing a melody of such ecstasy that all the pleasures of the world are null against it! First you have to hear the day laughing at the night, and only then can you merit....
Na Nach Nachma Nachman Me'Uman!