Task: Explanation
Input (English): Yoann Lemoine (born 16 March 1983) is a French music video director, graphic designer and singer-songwriter. His most notable works include his music video direction for Katy Perry's "Teenage Dream", Taylor Swift's single "Back to December", Lana Del Rey's "Born to Die" and Mystery Jets' "Dreaming of Another World". Question: French music video director, graphic designer and singer-songwriter, Yoann Lemoine, worked with what American singer/songwriter on the music video Back to December on her third studio album? Answer: Taylor Swift
Output (English):  His most notable works include his music video direction for Katy Perrys Teenage Dream, Taylor Swifts single Back to December, Lana Del Reys Born to Die and Mystery Jets Dreaming of Another World.