What is this? Well, on a lot of pony forums with RP, there is often a thread asking for your OC's theme song. This is similar, but different... it's kind of like, just post some songs that represents a certain aspect of your OC, or your OC as a whole. For example, maybe an OC is usually happy, and so a nice peaceful song is played for that aspect, however when the OC does get angry, maybe it's like 10 nuclear bombs going off, and they become an unstoppable force of rage and anger, so a more angry sounding song is used. It can be any aspect of your OC that you think a song represents perfectly.
My OC is an Android Unicorn, and so her emotions and personality are interesting. Here are some:
Angry and sad:https://www.youtube.com/watch?v=-fhj30f3aJ0