Listening mp3 songs/albums in the car

[Zepher]

Today I bought a free youtube to mp3 converter 1 year subscription for 23.75 euros, it works ok...
Transfer songs from youtube to mp3 format and the radio recognizes it.
https://www.dvdvideosoft.com/free-youtube-to-mp3-converter-en1

Even if, for example, you could separate one huge video with songs into individual songs, that would be great,but I don't think it supports it...

you can use Audacity to cut up the songs into individual tracks
https://www.audacityteam.org/

I haven't used it but it should work like most audio programs like SoundForge that I use.
You would highlight the section of the song you want, copy it and create a new track and paste it into the new track and then save it.