Chopin’s Posthumous Opus Nr 1 was a record that could be found in a small cupboard within the Smoking Room (1st Floor). The record itself is not an essential item to complete the game, but the music can be played when used by the Gramophone.
This article is too short to provide more than rudimentary information about the subject. You can help Alone in the Dark Wiki by expanding it. This template will categorize articles that include it into Category:stub.