Howlin'

This DVD box looks pretty massive:

Under the guiding vision of Executive Producer Martin Scorsese, seven directors will explore the blues through their own personal styles and perspectives. The films in the series are motivated by a central theme: how the blues evolved from parochial folk tunes to a universal language.

The seven-part film series includes:
Feel Like Going Home by Martin Scorsese
The Soul of a Man by Wim Wenders
The Road to Memphis by Richard Pearce
Warming by the Devil's Fire by Charles Burnett
Godfathers and Sons by Marc Levin
Red, White & Blues by Mike Figgis
Piano Blues by Clint Eastwood