You all probably already knew about Carly:

Carly Part 1

Carly Part 2

Carly Part 3

But you may not have known that one of the songs that Kelly Clarkson had recorded on one of her albums had been written for Carly and recorded years earlier by her. Listen to them both sing it and compare:

Carly vs. Kelly

And you may not have known about Kristy Lee:

Kristy Lee

And you might not have known about Michael Johns:

Michael Johns