where is the piano in guts and black powder

The piano is in the Copenhagen map, in the attic area where you place planks to progress. One Reddit report says you can hear it faintly near a barricaded door next to a deceased body, and the sound gets louder before stopping.

What players usually mean

People asking about the piano in Guts & Blackpowder are usually referring to that hidden ambient piano in Copenhagen rather than a usable instrument. It seems to be part of the map’s atmosphere and lore rather than an interactable object.

In-game context

The game also has music-related content tied to the Musician class and instruments like the fife, drum, bugle, and bagpipes, but those are separate from the Copenhagen piano sound.

TL;DR: Check Copenhagen’s attic/barricaded-door area; the piano is an ambient sound cue, not a standard pickup or weapon.