In paino playback we are dealing with a stream of notes, we don't have the leisure of seconds to count. But how some of the pianist can sight read a new piece in real time?
... to be filled with some text a bit about the problem of counting from reference note ...
can we do better?


TIP#1: You do not need to count to know which line (or space) a note is on (e.g. this one is in the middle). TIP#2: Open and close the card until you see the key even when the card is close. TIP#3: Do you know that both the lines and spaces are repersenting white keys? Each white keys can line up nicely with all the line and space. It's like turning a full piano keyboard 90 degrees counter clockwise.