There are at least 8 artists called "X".
These are photos from concerts where X played, so they may be of other bands that played the concert as well.
Midnight Oil / Ziggy Marley and the Melody Makers / An Emotional Fish / X / Hothouse Flowers Aug 28, 1993 Atlanta, Georgia, United States Uploaded by Igatti
New Order / X / 808 State Jul 26, 1993 Los Angeles, California, United States Uploaded by Nairb
HFStival Jul 3, 1993 Washington, D.C., United States Uploaded by Shorty Breadbox
Dramarama / Stone Temple Pilots / X / Gin Blossoms / The Lemonheads / Terrence Trent D'arby Jun 12, 1993 Irvine, California, United States Uploaded by R Keev19