There are at least three bands called Crumbs:
These are photos from concerts where Crumbs played, so they may be of other bands that played the concert as well.
Dream Nails / Crumbs Aug 2, 2018 York Uploaded by Davrob
Traffic / Crumbs / Quicksilver Messenger Service Mar 29 - 30, 1968 Los Angeles, California, United States Uploaded by Sundae