Another odd instrument that’s perfect for the Dusk.
https://www.youtube.com/watch?v=GVTcv7t_iCU
I picture a street busker up some stairs on a public street, with a pipe down to the water, surveying the street and playing soulful and weird water music.
A noble endowed the instrument and players for it, in memory of his mother, to play always over the street where she died. Only a few people still know the story two hundred years later, but one of your crew grew up on this street and has the music of this instrument twined with a lifetime of memories. It plays in the background, usually audible, when you’re in your lair and planning your heists.