
1) Baroque chamber work 2) One of six bach compositions
Found on
https://www.crosswordclues.com/clue/trio-sonata

The trio sonata is a musical form that was popular in the 17th and early 18th centuries. A trio sonata is written for two solo melodic instruments and basso continuo, making three parts in all, hence the name trio sonata. However, because the basso continuo is usually made up of at least two instruments (typically a cello or bass viol and a keyboa...
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http://en.wikipedia.org/wiki/Trio_sonata

major chamber-music genre in the Baroque era (c. 1600–c. 1750), written in three parts: two top parts played by violins or other high melody ... [6 related articles]
Found on
http://www.britannica.com/eb/a-z/t/81

Most important form of Baroque chamber music. It was usually written for two violins (or viols) to play the melodies, and a cello (or bass viol) to play the continuo bass line. An additional continuo player was also needed to fill in the harmonies on a keyboard instrument (harpsichord or organ), which actually meant that four players were needed. A...
Found on
https://www.encyclo.co.uk/local/21221

a 17th-18th-century sonata for two or three melody instruments and continuo accompaniment
Found on
https://www.encyclo.co.uk/local/21784
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