Four-part harmony

thumb|A street brass quartet In music, a quartet (, , , , ) is an ensemble of four singers or instrumental performers.

Klapa music is a form of traditional a cappella singing with origins in Dalmatia, Croatia. The word klapa translates as "a group of friends" and traces its roots to littoral church singing. The motifs in general celebrate love, wine (grapes), country (homeland) and sea. Main elements of the music are harmony and melody, with rhythm very rarely being very important. In 2008, Croatian Ministry of Culture proclaimed it Croatian Intangible Cultural Heritage. In 2012 klapa was inscribed in UNESCO Intangible Cultural Heritage of Humanity.

type of vocal harmony

style of polyphonic folk singing characteristic of Sardinia, particularly the region of Barbagia

tradition of sacred choral music, originating in New England in the 18th century and carried on in the Southern U.S., using tunebooks printed in shape notes

music written for four voices or instruments