He has a just great sense of humor, in addition to being a really dynamic singer. A subset of my group (13 of us) was involved in singing on a CD of Yiddish partisan songs. He just embodied the spirit of that one, called   "Shtey oyf tsum kamf" (Rise Up And Fight). No matter how we threw ourselves into it, we were just the ultimate white-bread chorus on our cuts compared to the songs he sang. A real privilege to be involved in that project with him.