Mr Big (note that there is no period after "Mr") was a UK act from the 1970s. It was a stage name for vocalist Jeff Dicken. His biggest hit was "Romeo" in 1977.
These are photos from concerts where mr big played, so they may be of other bands that played the concert as well.
Sweden Rock Festival 2011 Jun 8 - 11, 2011 Norje, Blekinge, Sweden Uploaded by Jarle Lindeland