TOUGH to acquire 4x6-inch black and white portrait, boldly signed in black felt-tip marker around 5 years ago. In good condition. There has never been an entertainer quite like Tom Lehrer, a Harvard mathematician who had a double career as a comic singer, songwriter and pianist. Called "a miracle" by his childhood friend Stephen Sondheim, Lehrer's brilliant musical feats included setting the period table of the elements to song, "Poisoning Pigeons in the Park," "The Masochism Tango," "We'll All Go Together When We Go," "The Vatican Rag," and too many others to list.

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