Memorising notes as one memorises a speech in foreign language is bound to lead to memory lapses. YouTube is an invaluable tool; you can get to study your repertory with the best pianists of all times. Use it. If you are learning a piece, don't hesitate to put your headphones on and just play along with your favourite recording. No matter how many times you hear the playing you will not grasp all the finer points if not directly measuring your inner hearing of music with the an interpretation you like.

pianistmagazine.com.