The Auteur Theory is the theory he is describing. "The term “Auteur theory” is credited to the critics of the French film journal Cahiers du cinéma, many of which became the directors of the French New Wave.Aug 1, 2017"
”The Yalta Conference, also known as the Crimea Conference and code-named the Argonaut Conference, held February 4–11, 1945, was the World War II meeting of the heads of government of the United States, the United Kingdom, and the Soviet Union to discuss the postwar reorganization of Germany and Europe.”
Answer:
To improve your singing and your tone, it's a great idea to practice both your head voice and your chest voice, and be able to recognize when each is best to use low and mid-range notes are often more comfortably sung in chest voice, while high notes require the use of your head voice.
Explanation: