zhè / wèi / gē / shǒu / zài / yǎn / chàng / huì / shàng / wèi / guān / zhòng / chàng / le / yì / shǒu / xiǎo / yè / qǔ

这位歌手在演唱会上为观众唱了一首小夜曲。

The singer performed a serenade for the audience at the concert.