USELESS
Its hard to believe the other reviews.
I cant imagine how this helps anyone to recognize notes on sight. The lines, from the bottom up, are EGBDF, and the spaces are FACE, and its more useful to memorize the positions of notes than to try to find the right answer by tapping every key until you hit it right. (And that much you can easily draw, yourself, and maximize time on the notes youre least sure of, too.)
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Notes! - Learn To Read Music, v1.5