A capella voices means singing without an instrumental accompaniment. In Italian, the term means ‘in the style of the chapel’. This reflects its religious importance: since the Renaissance, a capella music has played an important part in many church services as a form of religious worship and celebration. Non-religious a capella groups are also very popular, particularly in America, and have been celebrated in film and television.
A capella music can be homophonic (which means ‘sounding together’ through block chords), polyphonic (different sounds or voices) or sung in unison.