BBC 4 has been doing some good music documentaries on music from 1970-era forward, from the British perspective
BBC Music For Misfits: The Story Of Indie - The DIY movement (part I of III)
https://www.youtube.com/watch?v=Zz36_a0G7gk
Punk Brittania (full eps seem to be gone for now)
trailer (pre, 77, post)
https://www.youtube.com/watch?v=8VQfV7dBwu8
Northern Soul : Living for the Weekend BBC Documentary 2014
https://www.youtube.com/watch?v=dNAiKCWMv30
thank you again, amazing resources!