Summer commercial of KFC 

"Best Day of My Life" is a song by American indie rock band American Authors. It was written by band members Zac Barnett, Dave Rublin, Matt Sanchez, and James Adam Shelley, along with producers Aaron Accetta and Shep Goodman. The song was a radio hit in many countries.  Now "Best Day of My Life" can also be heard in the summer commercial of KFC in the territory of Poland, Hungary and Czech Republic

Song: „Best Day of My Life”  
Artist: American Authors  
Authors: Aaron Accetta/ Zachary Michael Barnett/ Michael D. Goodman/ David M. Rublin/ Matthew John Sanchez/ James Adam Shelley
Published by: Round Hill Works / Sony/ATV Music Publishing / Schubert Music Publishing