By Jim Harrington

"The Case of the Three Sided Dream" should be mandatory viewing for all music fans. It's a film that illustrates, perhaps better than anything I've watched in recent years, the vast potential of music.

It's a documentary on jazzman Rahsaan Roland Kirk, who, simply put, was one of the most amazing artists in American music history. He was a fearless innovator and sonic adventurer, whose legend deserves to only grow with time.

Kirk was so impressive to behold onstage that it's no wonder "The Case of the Three Sided Dream" is so captivating. He was widely known as a "one-man reed section," for his ability to play multiple saxophones and other instruments at the same time. Kirk -- who died in 1977 at the age of 42 -- was also an outright genius.

Rahsaan Roland Kirk in the documentary "The Case of the Three Sided Dream."
Rahsaan Roland Kirk in the documentary "The Case of the Three Sided Dream." (Photo by Chuck Stewart)

"Rahsaan could play anything," says trombonist Steve Turre, who was a member of Kirk's band.

Kirk claimed he could "split" his brain and play two different musical melodies simultaneously. It's one of those things that must be heard to be believed. And you can hear it — and believe it — if you watch this film, which had its world premiere at the 2014 South by Southwest film festival in Austin, Texas.

Yet, Kirk offered more than just a novel approach to performing. He also made some incredible music, which has clearly stood the test of time. That's also covered in this film, which makes an overall convincing "Case" that Kirk was one of the true greats.

Follow Jim Harrington at http://twitter.com/jimthecritic.