Some animals can get further than these simple noises. For instance, a bird song is much more elaborate, for it tells other males to keep away, while at the same time inviting a female to come closer.

一些动物能发出比这些简单的声音更复杂的声音，例如，鸟儿的歌声就更复杂精细，因为它能告诉其它雄性鸟离开，同时邀请雌性鸟儿靠近。

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Intense concentration swaps for giggles as one of the girls stumbles a fraction while trying to keep time with the heart-clutching melody of the song.

BBC: High spirits in Bali

Every time Pandora adds another listener, its costs go up because it has to pay royalties every time a song is played and those royalty costs keep going up.

FORBES: Expect Lots More Ads on Internet-Only Radio Sites