Giulys, ninth symphony (beta)

You are the caretaker of a cemetery, your job is mostly to make sure no one enters and damages the graves, but one night, a strange melody played, filling the graves with new life, undead life and raising a walking nightmare, will you find the one responsible for this and stop the start of this hellish horde? I may change the initial prompt for a more direct one, this is a beta, All feedback is taken into account