Name the Justin Bieber song: "Your world is my world and my fight is your fight."

Explanation

"One Time" is the debut song of Justin Bieber. The song was produced and written by RedZone Entertainment's Christopher "Tricky" Stewart, Terius "The-Dream" Nash, and Kuk Harrell and production duo The Movement. It is the first single released from his debut EP, My World. It was first solicited to mainstream and rhythmic radio on May 18, 2009.