MP3s: where do Genres come from?

So I used a Linux tool to set the ID3 genre on all of my songs, or so I thought, but my car shows genres I didn't use, and doesn't show some genres at all (eg Oldies). It also has both Soundtrack and Soundtracks, misc and Miscellaneous.

The ID3 tag I was setting had about 150 fixed options that seem are stored as numbers.

supratachophobia said:

Did you use that same USB media before you did the genre tags, and then make the changes, and put the same media device back in? I have found that the car caches tag information and can do what you described. I took to renaming the root folder and then it forces a scan with updated information. Not ideal, but it works.

Click to expand...

I didn't know this, however this was a freshly-formatted USB drive and the music was copied off of a source that had never been in the Tesla so that's not it...

I figured it all out, please see my new thread here: Discovery: pseudo MP3 playlists in the MS!!