A quick linkdump of some really dumb music:
Food safety music - Microbes They Might Kill You! is a particularly inspired reqorking of Queen's 'We Will Rock You'. With a food safety message.
Dr. Chordate Biology, Plus... - A reworking of Elvis becomes 'Ain't Nothing but a ground Hog'. 'Furrier than Thou' is pretty special, too.
Greg Crowther has written a song about Pi. And one called 'Take me to the Liver'
There will be more, I know it...