The Amber and Jacob Club

Welcome to the Amber and Jacob Club,
Population two.
Of course, in this club,
There's really no room for you

Unless your name is Amber
Or else Jacob is your name,
You'll find that it hard to join
If what you call yourself's not the same.

But I have some bad news to share,
The roles of Jacob and Amber are filled.
And don't bother leaving your name and number,
As those roles will be retired if either of them is killed.

But the Amber and Jacob Club
Has got to be the best club in town,
Because it's the only club you'll find
The coolest cats around.