A "trio sonata" refers to a Baroque composition typically written for two melody instruments and a bass line accompaniment. There are several synonyms for this term, including "trio sonate," "trio-sonata," and "trio-sonate." Additionally, the term "trio sonata" sometimes encompasses works written for larger instrumental groupings, such as quartets and quintets. In these cases, "trio sonata" acts as a broad umbrella term for chamber music that features three or more instrumental voices. Regardless of how it is spelled or used, the trio sonata remains a pillar of Baroque instrumental music and a testament to the inventiveness and imagination of composers of the period.