No list of manatee songs would be complete without this.
RIP. 
Look, exactly what sort of music do you think a member of an endangered aquatic species with a taste for seaweed that grows in narrow channels and marshy areas is going to be a fan of? Delta Blues, of course. I have very few doubts that the Manatee had plans to look up B.B. (they are even getting to look alike these days! :)) and get down to some righteous music!