Sonata In the Baroque, the term 'sonata' was applied to a variety of works for solo instrument such as keyboard or violin, and for groups of instruments. In the transition from the Baroque to the Classical period, the term sonata underwent a change in usage, coming to mean a chamber-music genre for either a solo instrument (usually a keyboard), or a solo melody instrument with piano. Increasingly after 1800, the term applied to a form of large-scale musical argument, and it was generally used in this sense in musicology and musical analysis.
