Elite Beat Agents changed my life and how I perceive music. What an amazing game. If you didn’t cry when doing the You’re the Inspiration level, you have no soul.
Wish I could emulate it on my phone with S-Pen too but audio latency killed it last time I checked.
I have been meaning to get a drawing tablet and try Osu, and I will, but the songs in it are unknown Japanese anime stuff and don't appeal to me so it's not quite the same.
Heck, I think most of the tracks from Elite Beat Agents have Osu maps now.