It can be solo singing or playing or dancing.

可以是指独唱，独奏，独舞等。

youdao

The opera features unique solo singing, refined acting, rich percussion and funny comedians.

戏剧的特点是拥有独特的唱腔、优美的表演、丰富的配乐、滑稽可笑的喜剧演员。

youdao

The music of Native North Americans is primarily a vocal art, usually choral, although some nations favor solo singing.

本土北美的音乐主要是声乐艺术，通常合唱，虽然有些国家青睐独唱。

youdao

Recent conflicts and rural to urban migration that reduced the population of the region and changes in ways of life have caused a sharp decrease in the number of performers, resulting in the loss of many archaic styles and genres of solo singing.

UNESCO: CULTURE

Gaelic folk singer Julie Fowlis says she used to be "terrified" of singing solo in public.

BBC: Brave singer Julie Fowlis: 'I was terrified of singing'

She rose to stardom quickly, singing solo and mostly in Hebrew or English, packing concert halls and performing for Israeli officials and foreign delegates.

WSJ: Iran and Israel Can Agree on This: Rita Jahanforuz Totally Rocks