Conversation so far:
Was Bob Newhart a singer?
George Robert Newhart (born September 5, 1929) is an American stand-up comedian and actor, noted for his deadpan and slightly stammering delivery.
Did Bob Newhart ever have a top ten album?
His 1960 comedy album The Button-Down Mind of Bob Newhart was the first comedy album to make number one on the Billboard charts.

Question: Were there any other famous people on any of his albums?
Self-contained rewrite: Were they any other famous people on any of Bob Newhart's albums besides Bob Newhart?