Hi Sly,
Awww, that's actually one of my fav tracks too. You can hear it during the fireworks date, but also it'll come up randomly on the Main Menu/Start Screen.
The track is called "Hurt You" by Erick Torres & Angelo Jusepy. I *believe* it's free/royalty free...but I may have had to buy the track for commercial use. Sorry, I cant recall exactly.