Here's the link to download the program to convert mp3 (not sure if any other file will work) to brstm.
http://blog.dantarion.com/brawl-custom-song-maker-gui/*This is soooo not mine so don't give me credit*
And here's a link to a "How to" video.
*Again... soooo not mine. Don't give me credit*
Also I have soundtracks to many animes and nintendo games. You can request a mp3 file of a song, or the entire album if you want, and i'll post a link to it.
Here's a list:
Animal Crossing
Aero the Acrobat
Bomberman 64
Astro Boy
Bomberman Hero
Banjo Kazooie
Banjo Tooie
Bleach
Blue Dragon
Code Geas(s)
Donkey Kong 64
Donkey Kong Country 1/2/3
Diddy Kong Racing
Dragon Ball Z Burst Limit
http://www.mediafire.com/?sharekey=d9396c721b015b640f83d91f6dff7c38e04e75f6e8ebb871Earthbound/Mother 2
Halo 1/2/3
Jet Set Radio 1/2
Katekyo Hitman Reborn
Keroro Gunso
Kingdom Hearts 1/2/ Re:Chain
Kirby Air Ride/Canvas Curse/Super Star/Super Star Ultra
Every Great Mario Game... and Hotel Mario
Megaman 1-7/9/X1-8
Megaman and Bass
Metroid Prime 1-3/all Gba
Mirror's Edge
Mother 3/3i/3+
Naruto/Shipuuden
Pokemon R/S/E/D/P/P/Stadium 1-2
Secret of Mana
Sims 1
Almost All Sonic games
Soul Eater
Starfox/64/Assult/Command
Wave Race
All Zelda Games except NES and some GB
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Request Away!