This video was so much fun to watch.  Watch out Jason, Luke Bryan can SANG!

This maybe the most brilliant way EVER to market a smartphone app.  A famous singer records 1 part of his or her hit using the app.  Then fans can record themselves on the app singing the other part of the duet.

What if that fan is also a famous singer?  That's what happened when Country singer Luke Bryan recorded his duet on the Smule app singing "Want To Want Me" with Jason Derulo.

OK got me.  I'm downloading the app.

Check out this crazy entertaining video.

More From WKFR