Common elements of songs

[spudtater]

Was listening to teh Beatles today, when something occurred to me: how many songs are there which contain sections of repeated "You say X, I say Y" lyrics? Can think of three just off the top of my head:

1. The Beatles — Hello Goodbye
2. Fred Astaire — Let'S Call The Whole Thing Off
3. Queen — Bicycle Race

Anybody else got any examples, well known or not? Does this pattern appear in any traditional songs? What's the earliest example that you can think of?