Requiem for a dream: appeared when the save zone was attacked by "the undead".
In a heart beat: appeared first when Carter became a zombie and then when Camila tuned into a zombie.
Under the honey shine: appeared when Juan and Alexa kissed for the second time.
Memories: appeared first when Alexa confessed Juan her love for him and then when the survivors remembered their previews lifes.
Friend´s death: appeared first after the death of Carter and then after the death of Camila