The discussion of Baroque instrumental form begun in Lecture 15 now focuses on ritornello form and the Baroque concerto. We first differentiate between chamber and orchestral music. Next, we discuss the degree to which the opera house was responsible for the development of the orchestra, as well as genres such as overture, suite, and concerto. The three types of high Baroque concerti are defined and discussed. Finally, the concerto grosso is examined in detail, with special attention paid to the ritornello form, first movement of Johann Sebastian Bach's Brandenburg Concerto No. 5.