This is what is happening: Moonstar and her clan were having a normal day when a fire started. (It was actually a fire trap set by Lurkclan. Moonstar as a warrior accidentally killed their clan leader, so they are getting revenge). She ends up dying in the fire, trying to save Skykit. The person singing is Blackstar, (the leader she killed).
Thank you cocogirl111 and CatsRock3002!
