Sorry for reviving a dead thread, but I felt it was a mystery that needed to be brought to light.
Salivan, or "Sullivan," is the main character is referring to the character Rocky Sullivan from the movie "Angels with Dirty Faces". (1938) In this song, Sawao talks about the story of the film.
You can find more information here:
http://www.filmsite.org/ange.html
If you listen closely, you can hear Rocky's catchphrase, "Whaddya Hear. Whaddya Say?" in the beginning of SULLIVAN ni Naritai.