Imagine yourself on the African savannah, with a glass of wine or a nice cold beer in your hand, while literally hundreds of thousands of wildebeest graze around you.  You hear their grunts all day and all night, a constant, gentle background noise, punctuated every so often by the staccato haw-haw of a zebra or the woo-oop of a spotted hyaena.  It's never quiet in the Serengeti, but that's just fine; this is the kind of noise I like.