With a catchy tune and a dark undercurrent beat, "Bad Blood" narrates a friendship gone wrong. The singer explains that the small details and memories of days past are what define the relationship, but now things have gone sour. He says that there is bad blood but that bringing up the tension and reliving the negative events are harmful and that he doesn’t want to hear about it anymore. The bad blood is old, so it is said to be better to simply let it dry and leave what is passed in the past. In the context of a therapy experience, this song can be very useful in assisting in the process of letting things go. From grief to a bad romantic relationship, it never hurts to use a variety of tools in a journey of moving on from something painful, and music is excellent and can resonate easily with a variety of people. A helpful factor about this particular song is its vagueness; it mentions friendship, but the lyrics are general about letting go of hurtful events, so it can be applied in a variety of situations. The song says, "if we’re only ever looking back, we will drive ourselves insane,” and indeed, in many situations where people are not letting go of something, all they are doing is dwelling on the past. Past events cannot be changed, so having what is essentially a theme song to listen to whenever rumination begins can be a helpful corrective behavior.