(((scratching head)))Islamic Society of Baltimore???
Nope, can't be them, they appear to be going strong. ISB?
Incredible String Band. Seen by 100s of 1000s when they played at Woodstock, but none of them remember now, oops, I mean, they didn't make it into the movie or soundtrack AFAIK. ISB was (in part) world music before anyone heard of that; mostly just a very quirky, very talented band. Licorice, a longtime female member, I heard disappeared in the 1980s while hitchhiking across the US. The founders though are all living, and have done some recent reunion CDs and previously unreleased, that kind of thing.
ISB is definitely not for everyone. :')