There are at least three artists called ZAO:
These are photos from concerts where Zao played, so they may be of other bands that played the concert as well.
Vans Warped Tour Aug 7, 2005 Orlando, Florida, United States Uploaded by Ryan Berroyer
Zao / The Agony Scene / Fear before / If Hope Dies Jan 18, 2005 Kansas City, Missouri, United States Uploaded by Chris Kimpson