Since the 1970s, Boston DJ Oedipus has put on a Christmas Eve show from 6pm to midnight, with Christmas music from around the world, and even just from the local music scene. It started on WBCN, then moved to WFNX, and most recently landed on WGBH.
Oedipus doesn't maintain a set list - it's just whatever he's feeling like playing as he's doing it. His immense talent aside, it means that it's hard to learn about those songs, or even those bands. For the last few years, I've been recording it and trying to build the set list myself, from either what he says (he doesn't always!), or from Google searches.
Does it take the magic away? Maybe, but I feel that it's what little I can do for preserving something that's been actively disappearing.
It's both a creative feature of the medium and one which makes systematic study of it challenging, as there's often no official recording and study requires either researches making their own recordings or listening live, and in either event, listening at best at perhaps 2x realtime speed, which means that analysis is slow.
(How much AI and speech-to-text services might assist in this I don't know.)