Question: This is gonna be the best day of my life singer?
Disambiguated questions and answers: question: Singer of the song Best day of my life, released in 2013?
Band that sings the song Best day of my life, released in 2013?
answer: Barnett
Zac Barnett
American Authors
Natural Questions answer: Zac Barnett (from the Wikipedia article "Best Day of My Life")