Calling all sheep...

Kulning: "Kulning is an archaic style of singing/cattle call, traditionally employed outdoors in the grazing pastures of Scandinavia from the Middle Ages to this day. It consists of shepherdess's tunes, calls and tones of enticement, mainly used to keep contact with, and to call the cattle, but also to communicate with other people over long distances". Examples: 1, 2, 3, 4, 5, 6, 7.