A cappella is a style of vocal music performed without instrumental accompaniment. Singers use their voices to create melodies, harmonies, and rhythms, often imitating instruments or producing vocal percussion. This form of music can be found in various genres, including classical, pop, and jazz, and is popular in choirs and vocal groups. The term "a cappella" comes from the Italian phrase meaning "in the manner of the chapel," referring to the practice of singing in religious settings. Notable examples of a cappella groups include Pentatonix and The King's Singers, who showcase the versatility and creativity of vocal performances.