Since the first person who performed sang two songs rather than just one, everyone who followed did the same.
The question is not the perennial "Can a white person sing the blues?"
A question would later be asked based on what the person sang.
"I've tried to make the gold; only one person I knew could sing gold."
No black person had ever sung on the stage of the Met.
There are no physical reasons as to why any person cannot sing.
When a person sings a song, you should feel something.
Three children are not crying now because one person sang.
Typically one person sings the verse, while the others join in the chorus.
A mysterious person sang songs on the stage when everyone had gone home.