In Part 3 of the book “A History of Western Music” by Donald Jay Grout, we learn about the music of the Baroque period. This era was characterized by elaborate and ornate music, with composers such as Bach and Handel creating masterpieces that are still celebrated today. The Baroque period also saw the development of opera, which combined music, drama, and spectacle to create a new form of entertainment. The chapter also explores the rise of instrumental music, with the emergence of the concerto and sonata. Overall, the Baroque period was a time of great creativity and innovation in music, and its influence can still be felt in modern music today.