A Walk (Jonas Mekas, 1990)

"As I'm waiting for the light I will tell you a story. There was a man who kept searching for a melody he thought he had heard once somewhere long ago. Long, long ago. Then he found it. It was only one note. One tone. One tone, one note, he had heard once. It was his own brief cry in a dream". 

See film here: https://www.youtube.com/watch?v=_qj-LMIsM8c