There are at least 8 artists called "X".
These are videos from concerts where X played, so they may be of other bands that played the concert as well.
Squeeze / X Sep 9, 2019 Seattle, Washington, United States Added by Toph
X / Skating Polly May 24, 2019 Albany, New York, United States Added by Craig Mac
X / The Heartache State with Nick Barker Sep 23, 2017 St Kilda, Victoria, Australia Added by Righteyemedia