Hey thanks for there response i appreciate the feedback. The solution to the puzzle is entirely contained in that room, the guitar itself doesnt do anything but there is a key underneath it. The empty lockers were supposed to contain stuff but i overscoped the game a bit and so left them empty
You said that you had trouble seeing the key in the starting room so it makes sense you couldnt see that one, i should have made it easier to see sorry.
As for the note yeah its kinda useless, its supposed to direct the player once they make it to the second floor but i didnt properly explain it well enough so i understand the confusion