The band name is Matthews' Southern Comfort.
These are photos from concerts where Matthews Southern Comfort played, so they may be of other bands that played the concert as well.
Deep Purple / The Faces with Rod Stewart / Matthews Southern Comfort Jul 30, 1971 Long Beach, California, United States Uploaded by Stephenhuerta
Rod Stewart / Faces / Deep Purple / Matthews Southern Comfort Jul 23, 1971 Dania, Florida, United States Uploaded by Zimtrim
Rod Stewart / Faces / Deep Purple / Matthews Southern Comfort Jul 16, 1971 Pittsburgh, Pennsylvania, United States Uploaded by Zimtrim
Rod Stewart / Small Faces / Deep Purple / Matthews Southern Comfort Jul 10, 1971 Cleveland, Ohio, United States Uploaded by Zimtrim