@wonderrecal777 Please, read the wiki:
https://wiki.recalbox.com/en/tutorials/frontend-customization/add-custom-music-into-emulationstation

@sg Read this:

https://forum.recalbox.com/topic/16064/next-pixel-theme/636

@wonderrecal777

https://forum.recalbox.com/topic/25567/retroarch-ui

@matze1980 Now it worked. The program i was using to convert the songs was making the bitrate bigger, due to my lack of attention. I put on a second song but now it just keeps playing and doesn't change to the first song i put on, why does this happen?

@acris Yes I appreciate it is highlighted but it is an easy mistake to make and one that can have unexpected results. It turns out that for me that the last 4 files I'd added were the problem. I didn't even notice their sample rate. Easy mistake like I say but worth letting others know.

@paradadf I already read the first link, but when I add my music it replaces the other music from recalbox.

But.....
..........
Yes, Thx :
in your last link (I DL recalbox-themes-master.zip), and i found a music folder, with all the recalbox theme music (recalbox-themes-master \ themes \ recalbox \ music).

I will be able to take them and add them in the music folder of my usb key with my playlist.
That's works fine.

Big Thx!

I found the files in the .cue, everything worked!

Thank you.

@gaetan Oh ok. I'll look into it.

Salut, les versions de pop'n tournant sous mame sont très anciennes, l'intérêt est très limité.
Il vaut mieux un pc dédié dans ta borne, et chopper les HDD des derniers jeux 🙂

@supernature2k
I am immensely grateful with you! I swear I made my research in the forum and I found many topics that talked about this, but none of them were conclusive (the ones I saw). I found one that I think was the one I needed but it was in french, I translated with google translator, but I wasn't much of a help.
I found difficult to find the main theme.xml (even with WinSCP) but I did it.
I am truly grateful, thanks! You all make a great job!

Ihad the same problem. As @LBR59 said, the video is located here:
If you are on Linux (but I can imagine ffmpeg tools are also available on windows), this simple command line will create "outputfile.mp4" with the sound lowered:
ffmpeg -i recalboxintro.mp4 -vcodec copy -strict -2 -af "volume=-15dB" outputfile.mp4
Hope it may help

Gracias! Con ese programa pude finalmente añadir la musica.