Hey @lufcMOT, I have the same problem that @Maarius and @Aventius stated in the comment section.

The new intro theme plays until I select the dynasty on the map and start playing, after that only vanilla music is playing.

I tried ALL of the following solutions:

1. Skipped all the vanilla songs with the "Next Song" button; they repeat over and over again.
   
2. Used the "Verify Integrity of Game Cache" tool; same problem that the tittle suggests.
   
3. Deleted all vanilla music; surprisingly vanilla music is still there playing in an infinite loop.
   
4. Disabled all the Music DLCs; same problem that the tittle suggests.
   
5. Replaced the vanilla music with the mod music; same problem that the tittle suggests.
   
6. Dowloaded your other mod that disables all vanilla music; same problem that the tittle suggests: https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1314746167
   
7. Deactivated HIP with(out) the mod above and this mod on; same problem that the tittle suggests.
   
8. Manually dowloaded the mod and did nearly the same things as above; same problem that the tittle suggests.
   
9. Manually changed the "songs.txt" copy-pasting the one of the mod mentioned in the solution #6; same problem that the tittle suggests.

As you already saw none of these potential solutions worked. :c

I only have HIP and this mod, I already saw in the comments that this mod is in fact compatible with all HIP cultures, so that's not the problem.
I tried downloading and testing with other music mods (Slavic Music and Crusader Music) and they worked as intended.

So...
Sadly is a problem related only to this mod, it's a shame because I as a history and RP nerd I loved the idea behind this and downloaded it immediately, the mod itself is very simple, but adds a great immersion factor, I hope that you can help me, it would be much appreciated.

Great mod btw.