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.
The Psychedelic Furs / X Jul 10, 2022 Ottawa, Ontario, Canada Uploaded by Daniel Sylvester
X / Los Straightjackets / Skating Polly Dec 16, 2019 Seattle, Washington, United States Uploaded by Pedronw