They found that when the whales off the coast of eastern Australia started a new song pattern, this version gradually spread from population to population.

他们发现，当澳大利亚东海岸的鲸鱼开始唱一首新歌，歌声会逐渐从一个群落传播到另一个群落。

youdao

They concluded that these pitch changes followed a pattern and were thus a song.

ECONOMIST: Male mice sing when they scent the female of the species

There is more emphasis on song now while it used to be the traditional hymn-sermon-hymn pattern.

BBC: Congregation outgrows church