Children classic songs will shift and change depending on where the teacher/singer has learnt the song...which country, which teacher and so forth. One of the examples is Little Bunnies Sleeping. I have heard so many versions of the song throughout my experience in childcare. Different words, and different tunes. But, regardless of the variation, the children still benefit and LOVE hopping. When I sing the song, I change the animal each time and often will let the children choose which animal they want sleeping. Similarly, I will chose an animal that correlates to the theme within the early childhood setting.