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.
X / Spokepoker May 7, 1994 Petaluma, California, United States Uploaded by Lilmikesf
Rage Against The Machine / Beastie Boys / Cypress Hill / X Apr 29, 1994 Carson, California, United States Uploaded by Russdudeman