There Are Many acts under the name "Null". It should also be noted that, when using some media players (e.g. Songbird), it will show the artist as null if the artist name has not been set.
These are photos from concerts where Null played, so they may be of other bands that played the concert as well.
Miserable / COURTESY / Null Sep 18, 2016 Birmingham, Alabama, United States Uploaded by Woven Antelope