The term "sextet" has been employed in literature to denote a grouping of six elements, and its usage often contrasts with other groupings such as a quartet. For instance, in [1] the term appears alongside a quartet, hinting at a deliberate structural or thematic distinction. Similarly, [2] juxtaposes both quartet and sextet—inviting readers to consider how varying group sizes can influence narrative rhythm or meaning—while also referencing an earlier example (Ex. 305) to establish continuity. Most notably, [3] highlights a transformation in structure within a single work: a quartet is introduced in Act II of The Tsar's Bride, which later evolves into a sextet in Act III (cf. Ex. 283). Through these instances, literature demonstrates that the sextet serves not only as a numerical descriptor, but also as a tool to underscore shifts in tone, structure, or dramatic dynamics.