I have loved Joe Reilly’s song, Be kind since I found it on the Internet a couple of years ago and I have Joe’s permission to share my materials with you.

Joe and his students: 

https://www.youtube.com/watch?v=F6LO3DEQBnQ

There is also a karaoke version:

https://www.youtube.com/watch?v=cL2weFUzRqg

The children I work with love the song just as much as I do. I have added actions and adapted Joe’s slightly as I work with children who are learning English as a Foreign or second language.