The collective action of two or more people towards a mutually shared aim or outcome. This may extend beyond electroacoustic music to collaboration across art forms (e.g. musician and dancer or video artist) or disciplines (e.g. musician and computer programmer or hardware designer). Although in evidence in virtually all forms of traditional and contemporary music-making, the term has not been used as widely as it is in, for example, theatre, performance art, dance or the visual arts.