The easiest way to beat the CPU is to just follow the lines on the rhythm bar exactly. The CPU even on the hardest difficulty is kind of dumb, and will just repeat whatever line you come up with.
Hitting the offbeats will usually lead to you knocking out alot of points towards the opponents. This is an example with any of the following notes during the phrases (XX-X-X-X-X). Besides that try copying what I or someone else is doing in videos, and try as best you can to make it sound good.
@@AlexanderBrior Another thing you could do is try to copy the opponent. The game tends to reward points towards you, and deduct points from the opponent.