one music score and last music stan

I have gone through everything and I can't find the last music stand and one music score. I believe the arrows always lead me to the library, but from there...nothing.

If I remember correctly, they are scattered in different places for different people. They also hide them very, very well. I had the same problem and ended up just clicking on anything and everything, especially behind chair legs, the stair railing, etc. until I found them.