Is it possible to add custom music/stages/skins with a Project M iso?

[masterexploder9]

So I lost my disc copy of brawl and I can't seem to find an iso download of NTSC Super Smash Bros Brawl. I play Project M by loading essentially a Brawl iso with the mod built into it that I found online. (I'm not sure how this works, I know you can make it so that the Brawl iso runs with the mod so you can just run it from USB loader without having to go through anything else, but I'm not very familiar with it)

Anyway, is there a way I can add custom music with just a Project M iso and not through the standard way of going through the project m folder? I have a softmodded wii.

 

[Sour Supreme]

I think I've seen the ISO you're talking about, it's Brawl with PM pre-patched in, so I personally don't know how to edit the Content.

I'm not allowed to post it here, but if you want when I get home today I'll PM you a link of where I got my ISO.