There are so many great links, that it would be impossible for me to list them all.
      Karl Ellison has done such a fantastic job of putting together just about all the links related to Music Rolls, Player pianos, Player Organs, Music Boxes, etc... that it would be redundant for me to list them. So, please go to the Mechanical Music Digest also known as the MMD and you will find just about any link you could possibly want. Have fun!