Tom Lehrer on public domain (2020):

https://tomlehrersongs.com/

The recording is from Copenhagen, Denmark, in September 1967.

Here are some other links:

Tom Lehrer on DVD:

https://www.amazon.com/Tom-Lehrer-Col...

The Tom Lehrer tour dates:

http://dmdb.org/lehrer/concert.html

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Recording date: September 5th 1967
Location: Falkonercenteret, Copenhagen, Denmark
Format: Most probably Ampex Quadruplex PAL 4:3
Status: A rare recording indeed
Storage: Most probably Sony Digital Betacam and in a digital format
Production and preservation: Danmarks Radio (DR) in Denmark
More HERE:
http://www.dr.dk/Salg/DRsales/Contact...