Wikipedia definition
1. Trio sonataThe 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, performances of trio sonatas typically involve at least four musicians, and some 18th-century published editions have duplicate partbooks for the bass (Mangsen 2001).
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