I believe "Jacobson" is Eric Jacobson (banjo player) who, with Pete Childs and Dwayne Storey and Stu Ramsey, was THE KNOBLICK UPPER TEN THOUSAND---a sort of Bluegrassy-Kingston Trio-ish mix of a group in Chicago in the 60s. Made a couple LPs for Mercury Records. Later, I seem to think that Eric Jacobson was an agent for the Lovin' Spoonful and went on to write for Saturday Night Live.

Art