There are at least 9 artists that go by or are known by a variant of the name "Oz":
These are photos from concerts where Oz played, so they may be of other bands that played the concert as well.
Jimi Hendrix / Oz May 3, 1970 Saint Paul, Minnesota, United States Uploaded by Zimtrim
Jimi Hendrix / savage grace / Oz May 2, 1970 Madison, Wisconsin, United States Uploaded by Zimtrim
Jimi Hendrix / Oz May 1, 1970 Milwaukee, Wisconsin, United States Uploaded by Zimtrim
