Some (short) parts of the Beatles tape can be heard here:

https://www.youtube.com/watch?v=G-Pb1-jh9Kg

The recording is 27 minutes talking about the tape and its history and what will possibly be done with this unexpected discovery.

I am a Fantasy - Clodagh Rodgers 1969
Every Little Kiss - Mike Berry  1962
October 26 -  Pretty Things (or Grass, from the same album)  1970

First three I found...

An interesting life immersed in music he loved:

https://bestclassicbands.com/louis-clark-obituary-elo-orchestra-hooked-on-classics-2-13-21/

Songfacts did an interview with him in 2007 which I found to be really enjoyable. He discusses the songs mentioned in the above posts and there are links within the piece to further information on those songs.

https://www.songfacts.com/blog/interviews/charlie-daniels

..And "First of May" has the distinction of being a song set in May which mentions Christmas!...(getting a bit off topic).

Beatles - "Flew in from Miami Beach BOAC" from "Back in the USSR" should qualify since the song apparently made #19 in the UK  and #11 in Ireland when it was released as a single in 1976 for the first time (according to Wikipedia).

Another obvious one -
Bee Gees - "New York Mining Disaster, 1941"

The first 45 I "got" was from my pen-pal in 1965. She lived in Los Angeles and sent me the American release of "Satisfaction" by the Rolling Stones (the UK release of that song was two months later and had a different B-side - all described in Wikipedia). In reply, I bought my first ever 45 and sent it to her - "Any Day Now" by the Alan Price Set (he formerly of the Animals - and it is a pretty good version of the classic). 

The last 45 I bought...well I had to dig that one out. It was "And the Music Plays On/ "In my Arms Again"" by Del Shannon and I found it in a London music shop, and it has the price still on it, £4. The original was released in 1974. 

In passing, my pen-pal claimed that she was living close to Jim Morrison in 1965 and had lots of stories about him, all forgotten by me, unfortunately! Just out of interest, the second record she sent was "Whittier Blvd"/"Evil Love" by The Midniters on the short lived Chattahoochee label. Google tells me that the label's biggest success was with The Murmaids in 1963. 

That took about ten minutes to write but I spent a couple of hours researching and getting sidetracked.

Dean Ford, former lead singer with Marmalade, passed away a few days ago.

Co-author in 1969 of one of my all-time favourites, 'Reflections of my Life'.

(Cannot post a link since this is my first post, but easily googled and his Wikipedia entry has been updated)