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.
Extreme / Mr Big Jun 3, 2018 Newtown, New South Wales, Australia Uploaded by Casandra