If love is the champion theme in "Annabel Lee," then mortality definitely comes in a close second. The speaker is obsessed with how and why Annabel died. He wants to know who he can blame for it. At the same time, the themes of death and love are tied together. The poem forces us to ask whether death is the end and has the power to kill love or whether, in fact love can triumph and continue after death. Maybe the speaker takes that idea a little more literally than he should, but that's his business. In a general way, we can all relate to the ideas of grief and loss and fate that come up when you talk about death.
Poe's portrait of excessive grief shows us the consequences of refusing to accept death as a fact of life.
Poetry becomes a tool which the speaker can use to transcend death. This poem offers a way of keeping his beloved Annabel alive.