We watched "ZZ Top: that little ol' band from Texas"
https://www.imdb.com/title/tt9015306/
It's a documentary about the story of said band, who've amazingly been going with the same line-up for 50 years.
It was a joy to watch, and was a real movie rather than a mere documentary. They'd cut in loads of archive footage, not just of the band, but of Texas in the 60s etc, cut with interviews of the band members, and others who they'd worked with, a few animations to help the story along, and some great music, theirs and other blues or psychedelic bands they'd been influenced by.
Whilst I like ZZ top, I'm not really a fan as such, so it's something to enjoy for anyone vaguely interested in music
As I indicated above, it's watchable as a film in its own right
Highly recommended !