Hello! The poetic device being used in the given song lyrics is Personification.
Here's why:
1. Personification is a literary device where human qualities are attributed to non-human things. In this case, darkness is being personified by being referred to as "my old friend" that the speaker has come to talk to.
2. Darkness is given the human trait of being someone the speaker can talk to, showing a deeper emotional connection and making darkness seem like a familiar companion.
Therefore, in the lyrics "Hello darkness, my old friend, I've come to talk with you again," the poetic device being used is Personification.
