Musical notes

I am in the cemetery keeps hut and I can't figure out what they want. I see what is written on the tomb stones but don't get what they are asking HELP!!!!!!

Same issue. Have all the keys and found all the notes but am unable to play through on the piano. What's missing?

It actually took me a while to find all the notes. I thought I had them all but was still having trouble. When I clicked on the sheet music, it showed me there were still notes missing so I had to go back out to the cemetery to find the rest.

I'm just finishing the game. Hope you found the solution before now!