I was thrilled to see Dangerous Minds recently post about the Punk chapter of the 1995 PBS documentary series, Rock & Roll, finally showing up on YouTube. (It hasn't been re-run in years, nor is it available on DVD. My homemade VHS copy bit the dust eons ago.) As DM pointed out, it's one of the few docs that really makes a point of completing the critical circuits between 70s punk and the reggae sounds of that same era.
However, the hour-long chapters dealing with proto-punk (The Wild Side) as well as early hip-hop/electro (The Perfect Beat) are also excellent, and now also online. The proto-punk edition focuses on the Velvet Underground (great interviews with Lou, Cale, and Moe Tucker), Iggy, the Doors, and Bowie, and the hip-hop chapter takes on Kraftwerk, Afrika Bambaattaa, Grandmaster Flash, and follows the narrative up through Run DMC, Beastie Boys, New Order, and The Orb.
Of course, it's easy to nitpick and complain about what the filmmakers foolishly left out or willfully ignored (ESG? The MC5?), but I still give this series very high marks for their overall presentation of the subject matter. In recent years, only that suberb Rough Trade documentary has surpassed this, I'd say.