Who was a pioneer of ambient sound?

Which of the following films introduced sound?

A. Jazz Singer B. Birth of a Nation C. The Great Train Robbery D. Citizen Kane

Which composition, written as a two-voice canon over a tenor, is notated in the manuscript in the shape of a circle?

a. Ubi papa, ibi Roma b. Par le bons Gedeons c. Tout par compas suy composés d. Douce dame jolie