Final answer:
The possibility of incorporating a soundtrack into a feature film was created by Dan Dugan in the 1968/1969 theatrical season with the development of sound technology.
Step-by-step explanation:
The possibility of incorporating a soundtrack into a feature film was created by the American artist Dan Dugan in the 1968/1969 theatrical season.
This was made possible with the advent of microphones and recording devices. Before this, films were silent, but with the development of sound technology, sound designers like Dugan were able to enhance the cinematic experience by adding music, dialogue, and other sounds to films. This revolutionized the film industry and paved the way for the use of soundtracks in feature films today.