I can't seem to get this mod to work anymore, and I'm not entirely certain why. It used to work just fine, but for a while now I've noticed none of the songs play and in fact are not even listed in the music player.

I have a total of three music mods subscribed. This one, the Endless Space 2 soundtrack, and the Stellaris Music Expansion Pack. Only the Stellaris Music Expansion Pack actually plays currently. I've checked for incompatibility by disabling the SMEP, but to no avail. I've also tried unsubbing/resubbing also with no effect.

I also subscribe to the Stellaris Sound Project mod which modifies Stellaris' sound effects. I tried disabling that as well, but again, this did not fix my problem. No other mod I have should be making changes to sound or music, though admittedly I haven't tried disabling everything except for this just yet.

Might you have some idea what's wrong?

Unfortunately I made this mod almost three years ago and no longer have the mod files.

I thought that SMEP might have some scripts running that change the selection of of music tracks causing them to not play but as they are completely absent from the music player I'm guessing this isn't the case. The only thing that makes any sense to me is a problem with SMEP, as although I haven't updated this for a long time music mods are very lightweight and aren't affected by game updates.

I can only suggest a complete clean reinstall of the game (with no mods). Maybe then you could try installing other music mods before SMEP and see if that changes anything. No guarantees unfortunately.

You could also try downloading the Endless Space OST and Warframe OST onto your computer and making your own custom mod (that you don't even have to upload to steam). Music modding is really simple even if you have no experience coding. The Stellaris modding wiki explains it really well and even gives you some templates to use to make the process easier. This should hopefully bypass any issues that steam is causing.

I hope this is helpful in one way or another and you manage to fix your technical issues.

So after some investigation I've found that, for whatever reason, Stellaris simply isn't accessing this mod. It was the same for the Endless Space OST. The mod file in Documents/Paradox Interactive/Stellaris/mod for your Warframe OST mod shows as having not been modified since November of last year, despite the others having been modified as of the last running of the game. In the case of the Endless Space OST, its mod file isn't even there.

I've since fixed my issue with the Endless Space OST by simply subscribing to another mod offering the same content, but there's no way to know how permanent that might be. Regardless it does indeed seem like the fault is on either Stellaris or Steam. Ultimately I will probably have to create my own music mods in order to be certain this doesn't happen again.

Thank you for your prompt and educational response. :)

... And now it works all of a sudden. Not sure what changed, but I'm not complaining.

Thanks for your help!