A soloist.
solo acapella. solo because of one person, acapella because there is no music.
Singing is singing. And if its a fast kind of talk of singing its most probably a rap.
A duet Is what two people singing together is called.
When groups are singing the same song but different tunes, it is called harmony. When the groups are singing together, it is called unison.
Four people singing is often called a quartet.
A soloist.
They would be called a soloist.
a Duettt :)
A "solo".
Two people singing together is known as a Duet.
scat singing? if that's what you mean
Such a person is a recluse.
A person who goes around singing at Christmas is often called a caroler. They typically sing traditional Christmas songs while spreading holiday cheer in their community.
The person who leads the prayers is called a 'cantor'.
You're describing what would be called "a capella" singing - the voice alone, no instruments.
The "cantor" is the person who does most of the singing in synagogue.
dictator