Music performed a cappella, less commonly spelled a capella in English, is music performed by a singer or a singing group without instrumental accompaniment. The term a cappella was originally intended to differentiate between Renaissance polyphony and Baroque concertato musical styles. In the 19th century, a renewed interest in Renaissance polyphony, coupled with an ignorance of the fact that vocal parts were often doubled by instrumentalists, led to the term coming to mean unaccompanied vocal music. The term is also used, rarely, as a synonym for alla breve.
A cappella
The Hullabahoos, an a cappella group at the University of Virginia, were featured in the movie Pitch Perfect
The Oxford Alternotives, the oldest a cappella group at the University of Oxford in the UK
The Sweet Nothings are one of the University of Exeter's eight a cappella groups. They are one of the oldest and most successful girl groups in the UK
Sheet music is a handwritten or printed form of musical notation that uses musical symbols to indicate the pitches, rhythms, or chords of a song or instrumental musical piece. Like its analogs – printed books or pamphlets in English, Arabic, or other languages – the medium of sheet music typically is paper. However, access to musical notation since the 1980s has included the presentation of musical notation on computer screens and the development of scorewriter computer programs that can notate a song or piece electronically, and, in some cases, "play back" the notated music using a synthesizer or virtual instruments.
Title page for the first-edition vocal score for Hector Berlioz's Béatrice et Bénédict
Page from the autograph score of Fugue No. 17 in A♭ major from J. S. Bach's The Well-Tempered Clavier
Sheet music for the song "Oregon, My Oregon"
A conductor's score and baton
