Kulning

This beautiful sound is an ancient call to bring cows home at the end of the day. It's said to go back to Viking days. Swedish artist, photographer and blogger, Jonna Jinton is fascinated by it and you can hear the result here. Note it also seems to draw husbands to come in from outside. Obviously it's very potent.

Oh and as a bonus - because cows apparently like other music as well - here is the New Hot 5 serenading cows in a field in France in 2011.