How to press the traditional four keys

the traditional four keys, if you really want to play well, you must first copy down the key sequence of each song and each group, and then memorize it, so that you can press it quickly without looking at the screen in the future. That's how experts play! In addition, if you want to get a higher score, you have to talk about everything in vain, followed by P, P, P, P, P, P, P, P, P, P, P, P, P, P, P, P, P, P, P, P, P, P, P, P, P, P, P, P, P, P, P, P, P, P, P, P, P, P