Buy Rocking Dan Teaching Man the album http://www.cdbaby.com/cd/rockingdanteachingman
Buy the video https://www.teacherspayteachers.com/Store/Rocking-Dan-Teaching-Man
A song inspired by the language of the measurement mass (lighter than, heavier than, greater mass, smaller mass, about the same as, kg, tonne) The song features lots of things that are heavier than and lighter than an elephant.