The term "a cappella" comes from the Italian phrase "alla cappella", which means "in the style of the chapel". In the Middle Ages, a cappella music was generally performed in churches and cathedrals. However, in the Renaissance, a cappella music began to be performed in other settings as well, such as schools, courts, and theatres.
A cappella music is often challenging to perform, as it requires singers to have a strong vocal technique and to be able to blend their voices together perfectly. However, when performed well, a cappella music can be incredibly beautiful and moving.