This is something that's been in my YouTube 'Watch Later' playlist for probably two years at this point, and have now finally got round to watching (over the course of two days). It is a surprisingly high quality recording from WTIC, a radio station in Hartford, Connecticut, the afternoon of the JFK assassination. On screen is a text timeline of the events in Dallas happening at the same time; this does mean a lot of pausing to read the text and then searching different names that appear and going off on Google tangents (or perhaps that's just me) - but if you're as interested in these kinds of historical broadcasts as I am, it's worth watching.
The recording starts with a show called 'Mikeline', which sort of appears to be the 1960s radio equivalent of Google. People calling in with enquiries, with the hope of someone else calling in later with an answer. After one call ends, the first news report comes in, and a second news report shortly after interrupts another obviously shocked caller, who declines to continue reading out a recipe, pretty much ending any sense of normality up to that point. Eventually they go over to the NBC network news.
It's interesting how late this station was in breaking the news, as according to the timeline other TV and radio stations had already been interrupted by the time they do their first bulletin. This recording also ends before NBC even confirmed officially that Kennedy was dead.
Whilst going down one particular rabbit hole, I came across this recording of an afternoon concert on WGBH radio in Boston, Massachusetts, where the conductor Erich Leinsdorf announces to the audience the news of the assassination. The audience gasps in disbelief as they respond not only to the news but to the announcement that the next piece played will be Beethoven's funeral march.
Here is a Time magazine article interviewing someone who worked at the symphony hall: