The letter, from Skeleton Sam, that mysteriously appeared under the front door of LVCRFT’s studio.

Translation:
My Dearest LVCRFT,
If you’re reading this, things haven’t gone as planned. I’ve been frantically working to free my one true love, my soulmate. When I saw her last, she was singing her guts out center stage at the sold out Saenger Theater on Canal St. in the French Quarter. The lights flickered out and when they relit she was gone; only a torn piece of sheet music remained in her stead. On it, she had scribbled the beginning notes of a musical composition. I believe the completion of this work will free her from her purgatory and have spent all my days including my last trying to complete the melody and solve this mystery.
I have left you all of my work in the only place I deem safe, my grave. You can find all of my wax cylinders, acetates and sheet music ideas using the map on the back of this letter.
Please, I beg you, find the right notes, but beware, the devil always comes back to collect and his minions are ruthless and will try to keep her.
Yours forever,
Samuel St. Skelevoie