Zac Barnett is the lead singer of the American rock band American Authors. Their song, "Best Day of My Life", has reached #11 on the US Billboard Hot 100, He will sing in the song "A Town Called Paradise" on the Tiesto's album of the same name,Singer Zac Barnett of American Authors performs onstage during Nickelodeon's 27th Annual Kids' Choice Awards held at USC Galen Center on March 29, 2014 in Los Angeles, California.