All of their songs. Let's be more specific..
Up All Nigh: Stole My Heart/More Than This/Moments/I Wish/Save You Tonight
Tell Me A Lie
Take Me Home: Change My Mind/ Last First Kiss/Truly, Madly, Deeply
Irresistible/ Loved You First/ Heart Attack/Summer Love
Midnight Memories: You & I/ Half a Heart/Something Great/Trhough The Dark
Little White Lies
And Mooooore