Burst of Duets

What's with sudden bursts of duets?

First we've got Jason Mraz and Colbie Caillat with Lucky

And after that we've got James Morrison and Nelly Furtardo with Broken Strings.

Now, I found out there's Jon McLaughlin and Beyonce with Smack/Smash Into You.

The best part??

They all sound almost the same.

Isn't life "wonderfully colourful and diverse"?