Well, we don't really seem to be talking love songs anymore, but...

math & science favorites of mine:

Monty Python: "Just remember that we're standing on a planet that's evolving..."

They Might Be Giants: "The Sun Is A Mass Of Incandescent Gas"

Moxy Früvous: "Entropy", "The Mitosis Waltz", "Guinea Pig (well, biotechnology, anyway ;))

Moll