(n.) A composition of four voices or instruments\.

German band Little Joe Philharmonic band big band bipartisanship biquadrate brass brass band brass choir brass quintet brass section brasses callithumpian band chamber orchestra coaction coadjuvancy coadministration coagency cochairmanship codirectorship collaboration collaborativeness collectivism collusion combo commensalism common effort common enterprise communalism communism communitarianism community complicity concert concert band concord concordance concurrence cooperation cooperativeness desks dixieland band duet duettino duo duumvirate ecumenicalism ecumenicism ecumenism ensemble ensemble music ensemble singing esprit esprit de corps fellow feeling fellowship four four-part diaphony foursome gamelan orchestra group harmony jazz band joining of forces joint effort joint operation jug band mass action military band morale mutual assistance mutualism mutuality octet orchestra part music part singing part song polyphonic music pooling pooling of resources pulling together quad quadrangle quadrature quadrennium quadrilateral quadrille quadrinomial quadruplet quatern quaternary quaternion quaternity quatrefoil quintet ragtime band reciprocity rectangle rock-and-roll group septet septuor sestet sextet skiffle band solidarity square square dance squaring steel band street band string band string choir string orchestra string quartet strings swing band symbiosis symphony symphony orchestra synergism synergy team spirit teamwork terzet terzetto tetrad tetragon tetragram tetragrammaton tetrahedron tetralogy tetraphony tetrapody trio triumvirate troika united action waits woodwind woodwind choir woodwind quartet woodwinds