I would love to see her sing a duet with jason aldean.

Taylor Swift & Carrie Underwood both are flawless when it comes to break up tunes dealing with retaliation. If the two did a song together, that would call for one damn good revenge song.

I'd love to hear Carrie sing a duet with Chris Martin of Coldplay. I think they'd kill it. I saw youtube videos of her covering Fix You while she was touring overseas and it was amazing.

I would love to see Carrie duet with Kelly Clarkson ;)

I would love to see Carrie and Hunter Hayes sing a duet together!