Maid of Sker

There are 5 instruments you can interact with throughout the game, only one is really missable. You simply must press a few piano keys on each for it to count.

The first one (and only one to miss) is at the beginning of the game. In the greenhouse like room with the first Gramophone, there is a piano on the left.

The second you can interact with is the Organ in the Grand Hall. It is up the steps in the main room.

The third you need the Music key to get, it is in the locked room in the basement. The lower right room in that square of smaller rooms connected to one another. You will come back to this floor for plot purposes later, so don't worry about backtracking to get it.

The fourth you need the Bird Key. It is in the locked room on the first floor on the middle right side of the map.

The fifth you need the Crown key. It is located on the second floor. It is in the room across from the saferoom on the right.

I made a Walkthrough showing U ALL THE MUSICAL INSTRUMENT LOCATIONS in the Game. Thier's about 5 MUSICAL INSTRUMENTS to unlock in the game. The Achievement will Unlock after u play the last Musical Instrument. Enjoy My Walkthrough :)