Can't You Hear the Wind Howl? The Life and Music of Robert Johnson (1998)
This docu-drama narrated by none other than Danny Glover covers all the basics of the Johnson legend and biography.
The Search for Robert Johnson (1992)
This short documentary was the exploration of John Hammond, Jr., the son of producer John Hammond who first re-released Johnson's work in 1961. It's both a fascinating account of some of the tall tales surrounding Johnson, and a record of Hammond's personal adventure.
Crossroads (1986)
This once-popular drama is based heavily on the legend of Robert Johnson.