Music Sight Reading vs Reading/Studying Music
Learning how to read piano music
does not automatically make you a good sight reader, and sight reading a
piece well does not mean you have actually learned to play it.
Eh?? So how can this be?
Sight reading can be compared with skimming through a book.
It gives you
the general idea of a story, understood (performed) more or less well,
but you have not yet studied the book.
Learning a piece well, however, means you have to go deeper; you need
to study the book, and give it more work and time in analyzing it and
even to memorize it.
A pianist needs to learn both how to read piano music and techniques for music sight reading.