Summer of Soul: New film revives lost Harlem Cultural Festival of 1969

A new documentary film called the Summer of Soul explores the Harlem Cultural Festival of 1969, attended by around 300,000 people, but forgotten for more than half a century.

The film's director Ahmir Thompson says the festival could have been the "Black Woodstock" and the fact is was forgotten is part of "the all-too-common erasure of black history."