It's called "First Cut is the Deepest"
The hit has been sung by many throughout the years (including Cat Stevens).
Even Sheryl Crow did a nice remake of the tune back in the 90s. I came thisclose to using her version but in the end Rod won.
Enjoy!
🎤🎙🎶
https://music.youtube.com/watch?v=c5NRH_DxWJE&feature=share