Here's what I think that song was supposed to be used for: I believe it was designed for both cows and goats to have their milk production improve drastically but there was clearly something the creator of it never thought of before making it accessible to the public, if a woman hears the tune, well her breasts fill with milk to quite the extent as shown by both Malon and Zelda having it happen to them. It also has a side effect of increasing a woman's lustful side to a point where they will be rather tempted to have the nearest person drink their milk. Thankfully affected women return to normal once their milk has been completely emptied, but they still remember the feeling of it happening to them.