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Katrin has an excellent ear for music, so the battle with her will not be easy. In order to win the battle, Boyfriend needs to sing the song to the very end, unmistakably playing every note of the song. To do this, you need to press the arrow keys in time when you see that the moving arrows on the screen coincide with the fixed icons at the top. Try not to make mistakes that threaten you with failure, and Boyfriend with the loss of the status of the king of music.