New cloned interaction for guitars not showing up

Heya!

I'm venturing into tuning files and I'm trying to add a new music style to guitars.
Specifically, when you click "Play Song..." on guitars, I want to add a new interaction option for Metal songs. What I did so far is look up all the relevant files for playing Rock songs and copy/modify these. I gave them unique instance/tuning IDs and even made my own string table.

Problem: Nothing shows up ingame.

I tried to follow multiple tutorials, but no matter what I do, no sight of my interaction. I also made sure that my Sim has the required Guitar skill level for playing Rock songs.

These are the files in my package file:



Ignore the Audio Effects file and the second Recipe Tuning file, those are experimental and not linked to anything.

In the first file, I added a line for my new musicStyle on line 508:

<T>1383036494021133270<!--MusicStyle: musicStyle_Guitar_Metal--></T>
In the second file, I changed the parent pie menu to be my instrument_PlaySong_Metal category file.
The other files are basically clones of the Rock files with new IDs and text.

Is there a file/line I'm missing?

Thanks for your time! Cheers