Swing!

You say yes, I say no.
You say stop and I say go, go, go.
You say goodbye and I say hello, hello, hello.
I don't know why you say goodbye; I say hello, hello, hello.
I don't know why you say goodbye, I say hello.
I say high, you say low.
You say why? and I say I don't know.
You say goodbye and I say hello, hello, hello.
I don't know why you say goodbye, I say hello, hello, hello.