8-Track. Ohh, that brings back memories.
I used to spend Saturday mornings untangling and re-threading 8-Track cartridges when I was a lad working in our local TV and Radio shop...
The resident TV service engineer had a Radiomobile quadraphonic 8-Track (4-Track?) in his Fraud Zeypher and on which he introduced me to the heady delights of Pink Floyd, Deep Purple and Focus amongst others
In his TV Service van (a Fraud Escort) he had the latest and greatest of the time. The very first auto-reverse car cassette player made by Pye
8-Track cartridges were pretty cool and neat in those days.