This basic hello song, to the tune of “Good-Night Ladies” is great to use with children who are working on learning to wave, make eye contact and say “bye” or just approximate saying “bye.”  You can also change the words so they model a basic greeting: 

Hello x.

Hello x.

How are you today?

I am x.

Or

Hello x, Hello x,  Hello x.  It’s nice to see you today.