The O'Jays are an American R&B group (from Canton, Ohio, USA) formed in 1963 and one of the seminal Philly soul groups.
These are photos from concerts where The O'Jays played, so they may be of other bands that played the concert as well.
The O'Jays / Truth Pepper May 20, 1977 Philadelphia, Pennsylvania, United States Uploaded by Zimtrim