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Forms such as the concerto and sonata were more heavily defined and given more specific rules, whereas the symphony was created in this period ( this is popularly attributed to Joseph Haydn ).

The concerto grosso ( a concerto for more than one musician ) began to be replaced by the solo concerto ( a concerto featuring only one soloist ), and therefore began to place more importance on the particular soloist's ability to show off.

There were, of course, some concerti grossi that remained, the most famous of which being Mozart's Sinfonia Concertante for Violin and Viola in E flat Major.