Aha, I'm glad you logged this one , Chris ...
I logged a similar transmission an hour later ... More than likely I was a bit confused by that time in the morning - I choose to blame the 3 computers displaying 3 different times in the shack ... absolutely nothing to do with being an old man with an addled brain

I had a station coming up on 6935 transmitting in usb at a few minutes before 4am UTC. I didn't recognise the loud, heavy track. So I announced the freq and mode in the chatroom - no response.
At 04:00z (?) the station was playing "Killer Queen" followed by "How long has this been going on" Just the three tracks as far as I was aware.
I logged the signal, on this side of the "Pond" with a sinpo of 43333 very strong - stronger than the previous users of 6935U earlier in the evening (of course it might have been one of the previous users and I was just experiencing enhanced propagation at the time)