MP3 for Nintendo DS

I am trying to find out the way or software to uploads mp3/songs to my nds. Anyone could brief and help me with that topic?

There was a program that could upload files to your NDS to the builtin memory, but there was no way to play them, and it's not good to do that, as games use fill it up with temporary data. You're going to need a flashcart such as R4 or CycloDS.

If I were you I'd buy an R4 or and M3, then with your firmware, you could utilize the plug-ins to allow you to play MP3's without any problems. I'm currently using an M3 and it works just fine. You can also view/apply skins, photo's and even videos, so I'd recommend that.

Yes, using the built moonshell homebrew applicaton, you'll find that moonshell is part of many flashcart's firmware.

Most flashcarts play MP3 no problem with moonshell, so far uploading MP3s to the DS memory has been a bit of a failure.