There is more than one person with Leon Thomas as their name:
These are photos from concerts where leon thomas played, so they may be of other bands that played the concert as well.
Nina Simone / pharoh sanders / Mandrill / leon thomas / The Voices Of East Harlem / The Undisputed Truth Sep 19, 1971 Philadelphia, Pennsylvania, United States Uploaded by Zimtrim
Ray Charles / Gene ammons / Sonny Stitt / leon thomas May 9, 1971 Philadelphia, Pennsylvania, United States Uploaded by Zimtrim
Roberta Flack / Taj Mahal / leon thomas Feb 11, 1971 New York, New York, United States Uploaded by Zimtrim