From The Motif of Harmful Sensation:

The harp can play three songs: One of sorrow, one of joy, and one of peace. When heard, the song of sorrow inflicts pain, the song of joy causes laughter, and the song of peace brings calmness. The duration that the song is played changes the effect. If the song of peace is played too long, for example, the listener falls asleep, which can ultimately lead to eternal sleep, the equivalent of death.

I’m still not sure what this entire entry is about, but it’s interesting….