Do you say either has or has either?

You should say has either.

I think the song your talking about is : Black Sheep - "The Choice is Yours" The Lyrics are: Who's the Black Sheep, what's the Black Sheep? Don't know who I am, or when I'm coming so you sleep Wasn't...

You don't say it with a long e.

you can't wait either

"Sad to say" is the correct phrase. Example usage: I'm sad to say (that) Mary cannot join us for dinner. OR Example usage: I'm sad to say (that) Mary cannot have dinner with us. Use "sad to say"...