In Norse magick,specifically galdr, there is a type of lullaby magick that is basically a sung spell with the intentions of putting someone to sleep. These tend to be accompanied with slow drum beats, soft melodies, and repetitive rhythms. They can be very beautiful.
Well in a way I mean to play a song on a woodwind instrument, such as a flute, that will make somebody tired and eventually to the point of sleeping. I'm going to guess a song for gradually making somebody tire to the point of sleep.