I love to have preschool and Kindergarten students do this song because it promotes friendship and is easy to learn and sing. Even better when you incorporate hand motions with it. It is a very simple song to sing and if you play an instrument it is only two chords. I do it in the key of D, so the chords are D and A. If you start in C, the chords would be C and G. In the video I use ukulele to play it. This is such a great instrument for young children to see and even strum a little.
Have fun with this song.