Unfortunately the documentary went almost unnoticed when it was first released. The film which also includes footage of the extreme poverty of the West Indies and the makes a case for reggae's radical roots. Interviews with disk jockey Mike Raven and producer Graham Goodall review the history and development of the music. But for fans, the highlights of the movie are the performances by The Pyramids (Symarip), The Pioneers, Millie Small, Toots & The Maytals, Bob Andy and Marcia and Desmond Dekker.
The film is currently out-of-print and unavailable though there are 3rd generation copies floating around. A few years ago there was some talk of a reissue but there have not been any updates. There are a few clips taken from the film available on YouTube and MySpace. I've attached them below.
Here is footage from "Reggae" featuring Toots & The Maytals performing "Monkey Man"
Here is footage from "Reggae" featuring Bob Andy & Marcia performing "Young Gifted & Black"
Here is a clip from "Reggae" that explains the white skinhead phenomenon over Symarip's "Skinhead Moonstomp"
You can read more about Horace Ove and his storied career here.