Objects in image: Organ, Musical instrument, Book
Text visible in image: 523, J.S., BACH, (2, Orgelwerken, STEREO, Organworks, GESPEELD, ORGELS, LAYEDONIMEORTANTHISTORICALORGANS, Ewald, Kooiman, MOLLER, ORGEL, LEEUW, RDEN
Question: what number is in parenthesis on the top of the page?
Answers: 2, 2, 2, 2, 2, 2, 2, 2, 2, 2