There is a thing called "Google". I heard that if you type something in the search bar thingy on it, it will show thousands of results about the thing that you typed. I think if you type osu into it, you should get tens of thousands of results. However, some people are lazy (Like me) so just for you, I put a video of this guy playing a song. Try to guess where the song is from specifically what game and what's it called .