There are, at least, three bands named Quintessence: 1) A 60s/70s British psychedelic rock band. 2) A Finnish nu-soul / jazz / funk band. 3) A French black metal band.
Note: These are photos from concerts where Quintessence played, so they may be of other bands that played the concert as well.
Uploaded by Mr.Bassman
Johnny Winter / Juicy Lucy / Quintessence
Uploaded by Zimtrim