As an avid watcher of documentaries, there's just too many I've seen down the years to remember. I've seen hundreds and I tend to remember the last ones I saw as opposed to a great one I might have seen 14 years ago.
So many; Syd Barrett, sibling rivalries in rock, Miles Davies, David Bowie creating Ziggy Stardust, the Rolling Stones 5X5, The Monkees, Record shops, the making of Magical mystery tour, Rock managers, Dancing in the street, All you need is love, A to Zeppelin......where do I start and where do I finish ?
There are literally hundreds. We've long been fortunate in England since the 70s in terms of good documentaries. And at the moment, good ones turn up on BBC 1, BBC2, BBC 4, Sky Arts 1&2. And they repeat them endlessly most of the time so if you miss one, there's a good chance you'll catch it at some point before Jesus returns.
Something I've found about rocumentaries is that you don't have to even like the artist{s} in question or have heard of the engineer or manager or liked the album or whatever. The other thing I've found leads on from this ~ rocumentaries cover a really wide spectrum of subject matter and degrees of seriousness. I find the ones trying to be comedic and sarcastic really tiresome, despite the odd funny comment.