character piece
noun
1Any literary or artistic work chiefly concerned with the depiction of the personality of one or more of its characters.
2 Music a short composition (typically for piano) intended to evoke a given mood, atmosphere, scene, etc., without the use of text or stage action.
Origin
Mid 19th century; earliest use found in Encyclopedia Americana. After German Charakterstück and its model French pièce de caractère; compare earlier characteristic piece.