That ol' Java java jing jing jing
The Javaposse has been using a specific song as their theme song. It is credited to "Loose" Bruce Kerr, one of Sun's lawyers. I found this blog post: Java Jingle from 1997 which gives an MP3 of the whole thing.
The song was written in 1997.. as I noted yesterday that was in the thick of the issues with Microsoft. It's interesting what the rest of the song is, that is the part after where the javaposse cuts it off.