(Probably the most common question here) How to talk to a random girl at school

So, she is a year older than me, so we don’t have any classes together. I do know what music she likes, because we follow each other on instagram (everyone at school follows each other), and I do know some of her interests.

How do I open a conversation? It feels weird to just randomly walk up to her and say Hello or anything like that, but I don’t see her that often either. Any tips?

Edit: Just did some research, and found the word infatuation. This is probably that, but I’ve also found out a lot about her and would still like to get to know her.