Now everybody sing! I'll take the lead.

现在大家唱歌， 我起头。

《新英汉大辞典》

In call-and-response, the lead vocalist sings a line, and waits for the other musicians, chorus, and/or audience to sing back.

在这种演唱方式中，主唱会先唱一句歌词，之后就等待着其他乐手，合唱团，抑或是观众的回应。

youdao

The fifth button is for you to sing, case, slightly press pencil lead can become a microphone, let you go out to relax from the job, can get a kind of unspeakable joy.

第五个按扭是给你唱歌派用场的，只需轻轻一按，铅笔芯就能变成麦克风，让你从作业中走出来放松自己，可以得到一种说不出的欢乐。

youdao

Under a bright full moon, dozens of young, unmarried village women gather in a circle, join hands and sing and dance all night under the direction of a lead singer.

UNESCO: Culture