I've just started viewing 1841 for the third time, I believe.
In episode #1203, Melanie Collins is at the piano at Collinwood in a scene shared with Julia. At two intervals, Melanie briefly plays several bars from a lovely rather melancholy piano piece that sounds 19th century. There is a slightly discordant or minor key quality. I don't think it's Chopin, but I can't put my finger on what the piece is. It could even be later than the time period of the storyline.
I've checked all my resources, including the "Dark Shadows Almanac: Millennium Edition," to no avail. Kathleen Resch's 1840 Concordance summaries these episodes, but mistakenly says that Julia is playing the piano and Melanie enters the room.
Do any classical music lovers know what this piece is? I'm certain that VictoriaWinters would be able to identify this piece if she heard it ... are you there, VictoriaWinters?