I first heard his songs when I was still in high school. They remain relevant to this day. I keep a cassette tape of Lehrer's in my fishing car. Alicia sent me this:
http://www.privatehand.com/flash/elements.html
If you locate tapes of some of his great "poems" (The Vatican Rag, Pollution, National Brotherhood Week, Be Prepared, Rickity Tickity, Tin, etc.), please submit.
Tom's AT LEAST a master of the pop lyric, yet I think he was less well-known than, say, Randy Newman.
Bob