There are at least six bands/artists named Jack.
These are photos from concerts where JACK played, so they may be of other bands that played the concert as well.
Pounded Clown / 99 Tales / Jack Jun 10, 1994 Sacramento, California, United States Uploaded by Sacramento Shows
Square Cools / Magnolia Thunderfinger / Jack May 14, 1994 Sacramento, California, United States Uploaded by Sacramento Shows