Project Lovewing is a Rhythm game based from osu! and Love Live! School Idol Festival

Ok, so, serious question.
How the frick do you time a music game properly?
IN C#?

...Ok, maybe in C# it's just impossible, isn't it? Because I've done a metronome, it kinda works, but it's... wobbly... Because the thread stops every time the music effect is being played.
And also how do you make the notes...? ...I should design an entire editor for charts/maps, I guess, but how do I make that in C#?

So maybe I should try in Unity?
What do you think? I want to make a music game so bad ;–;

I don't think anyone said it yet so I'll have to choose osu!. It's a rhythm game and now it is being remade as open source. It also uses a open source game engine dedicated to rythm games. The osu staff is great and the main dev (peppy) streams on twitch while making the game sometimes.

It's a great project and I hope I can contribute some day.

A music game.