I'll explain the in-joke: Radium was the name of the premier, and to my knowledge only successful, "audiowarez" group. So if you were a teenager and you wanted to switch from Fast tracker II to "professional" tools such as Logic or Sound Forge, you'd likely find a pirated copy somewhere and if you did, it'd likely include an info file that said it was provided by Radium.
I have no clue who they were and how they managed to crack and spread just about every piece of super expensive audio software out there, but they did. I bet the vendors hated it but it was a life saver for us teenagers.