Editing String trio (section)

==Early history==
The earliest string trio, found during the mid 18th century, consisted of two [[violin]]s and a [[cello]], a grouping which had grown out of the [[Baroque music|Baroque]] [[trio sonata]]. Over the course of the late 18th century, the string trio scored for violin, [[viola]], and cello came to be the predominant type.<ref name=":0">Tilmouth, Michael (2001). “String trio”. ''Grove Music Online.'' Oxford University Press, 2001.</ref> String trios scored for two violins and viola were also used, although much less frequently.<ref name=":1">Brook, Barry S. (1983). “Haydn's String Trios: A Misunderstood Genre.” ''Current Musicology''. 36: 61-77.</ref> The term "string trio" was not used until the late 19th century. The genre was previously referred to as ''divertimento a tre'', ''sonate a tre'', and ''terzetto''.<ref name=":1" /> French composers sometimes used ''Trietti'' or ''Conversazioni a tré'' to name their trios.<ref name=":2">Herschel Baron, John. ''Intimate Music: A History of the Idea of Chamber Music''. Stuyvesant: Pendragon Press, 1998.</ref> The early classical string trio generally consisted of three movements, although four, five and six movement trios were later written.<ref name=":0" /> Most movements were in [[binary form]], although some of [[Joseph Haydn]]'s trios were written as theme and variations. The violins shared the important thematic material, while the cello maintained an accompanimental role.<ref name=":2" />