This 20-minute documentary, Bassline Baseline, about the Roland TB-303 bassline-generating synthesizer has been around since 2005, but you may have missed it, as I did. It’s an informative, breezy look at the invention, history, and utility of this crucial piece of gear in electronic/dance music (hiphop, electro, acid house, Big Beat, minimal techno, etc.). If you were ever going to use the annoying word "game-changer," you'd be justified in dropping it in regard to the TB-303.
Also, you gotta love (or hate) how the film’s narrator/director, Nate Harrison (who let me crash at his pad in Manhattan a long time ago; respect!), expresses way less emotion than the 303 itself.