Think about...

...the first five songs that crosses your mind and were written by Ryan Tedder. (Battlefield doesn't count, you'll see why)

1. Beyoncé - Halo
2. James Morrison - Please don't stop the rain
3. Jennifer Lopez - Do it well
4. Leona Lewis - Bleeding Love
5. Kelly Clarkson - Already Gone

  Any of them would sound just WICKED if Ryan sang them!! 
(besides, I'd listen to Ryan singing Already Gone by Crossfade... It would be just... WONDERFUL!!! Mainly in the end. Angry Ryan. OMG *-*)