how to play music on dslite with edge card

My son has an edge card in his dslite. I have read on here that you can play music on the ds. How do you go about doing that please. do you have to convert the tracks first and how can you play them. I'm a complete newbie at this so please help with easy to follow advice. thanks in advance. :)

You'll need a program called Moonshell.

Welcome at romulation.Download the moonshell player from here http://home.att.ne.jp/blue/moonlight/
Copy the moonshl2 folder to the root of your Micro SD. copy the moonshl2.nds file anywhere on your Micro SD (you can launch it like any game on your DS). gratulation you installed moonshell sucessfull.You can play mp3 files with it and doesnt have to convert them first.
PS: the music should be on the Micro SD too ;D ;D ;D

u can also play dpg. movies