I met Rufus Thomas once. Not one of the most famous singers but a fairly well known funk and soul singer. One of my high school teachers actually knew him and had him come to our school and give a little pep talk. Some of us stayed after his talk and met him. I was fortunate to get the encounter on video tape. We had another teacher who was always video taping school assemblies and I got a copy from him. I went to see him perform later after I graduated from high school, but I wasn't able to get close to him during that performance but definitely enjoyed the show.
Recently I met David "Fathead" Newman. Probably even less famous than Rufus Thomas, but he's well known in the jazz world as a great saxophonist. He was playing at a small jazz club here in DC and I he had CD's for sell there, so I bought one and had it autographed.