CERN -- the European Center for Nuclear Research -- has a choir. Here's their performance of "The Particle Physicists' Song", set to the tune of a Flanders and Swann song.
via GearFuse | Flanders and Swann Information
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Rolf Harris singing the Hippopotamus song - http://www.youtube.com/watch?v=AFUQasY3stA
However, they did write a song about a hippopotamus, the music being used in the Cern choir's song, and lyrics written by Danuta Orlowska of Cern.
The Hippopotamus song is here: http://www.youtube.com/watch?v=kN0WPwFD9is&feature=related