Abie You're a Rich Man was a 1967 Rutles song. Its lyrics pay homage to some unknown guy named Abie.
The song was originally written while the band was on their last tour in San Francisco at Candlestick Park where Dirk met Abbie Hoffman, the social activist. Dirk, having consumed a great deal of Tea, misheard his name and thought a social activist was someone who made a lot of money putting together parties. It wasn't until much later that Dirk realized his mistakes.