Music Shield pins D0-D9 - How to use for my own application?

Hi michaelcole:
I saw the picture,for the red circle,I think that is the problem.
Because the Music shield is using the SPI,so the res circle is the SPI connect,for this, I think you are not connect to the Music shield now.First you can test it with out the Proto shield,for the testing,you can set the pin(which you want to use) become INPUT mode.