We are a non-profit community who contribute customised video game music to the website.
The music files we supply (BRSTM - Binary Revolution Stream) are playable on Nintendo Wii games.
More information about using and creating the files can be found here in the official Smashboards.com thread.
We also have a site chat room on IRC. The server is irc.brawlcustommusic.net, the port is 6663, and the channel is #social. Here is a direct link for the channel.