Probably The Beatles' easiest song. You can also watch a modern version of this song by Jonas Brothers.

You say yes, I say no.
You say stop and I say go go go, oh no.
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", oh no.
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

Why why why why why why do you say goodbye goodbye?

Oh no!
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.

You say yes (I say "yes")
I say no (but I may mean no.)
You say stop (I can stay)
and I say go go go (till it's time to go )
Oh no.

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
Hello hello
I don't know why you say goodbye, I say hello hello.

Hela heba helloa CHA CHA, hela...