Did he not perform the song that makes reference to (or rather shares the theme of) the "World's Finest DC Comics" featuring the "negative superman"? I have head the audio clip from the performance, "in my head there is a negative superman," which was supposedly when he opened for fIREHOSE at CBGB's.
Haint is correct about only two songs being performed at CBGB. "Negative Superman" was performed a few days before at the Pier Platters gig.