Who made the theme song for the Heathcliff cartoon?

"For whatever reason, two versions of the Heathcliff (DiC series) theme song were made. The two only differ in the repeating chorus. The original chorus goes: Heathcliff, Heathcliff no-one should, terrify their neighborhood, the altered version goes: Cats and company have fun, playing pranks on everyone. The latter has only appeared in the VHS releases of the cartoon, (though it was also seen in reruns on cable). "