Acapella is an Italian word, which mainly refers to cappella without accompaniment, especially in harmony. Later, there was professional development. Schubert, for example, wrote cantata operas. Nowadays, acapella usually exists in pop music as a musical element, and more is vocal with accompaniment, which is also very nice. Of course, there are others who do the opposite. Instead of highlighting the human voice, the human voice is more like a musical instrument, such as Enya, which many people like. Of course, there are more examples in rock music. Others, such as Tibetan Sanskrit Cantata, produce an effect like the electric sound of a bass horn, and there is a special singing method of some tribes in Africa: throat, which is a very strange effect.