A grand piano in a bay window is a classic pairing. The shape and height of a baby grand piano fits the shape of the space, and a bay window alcove is a natural "stage" for a performance to an audience in the room. A grand piano isn't the only musical instrument that looks good in a bay window. A harp looks good in a formal or traditional room, and a drum set or guitar and stool add a hip musical element to a modern room.
Built-in furniture leaves the space in front of a bay window accessible. A built-in window seat transforms a window into a cozy nook for reading, working or relaxing. Bench tops can open for extra storage inside, or the seat cushions can sit atop built-in shelving below the level of the windowsill. Omitting furniture in the alcove works well for a bay window that offers spectacular views, making the window approachable for visitors who want to enjoy the vista.
A traditional furniture arrangement for a bay window is two wing chairs with a round or oval table between them. This classic setup provides a quiet conversation area for two and overflow seating for the room. Designers often use furniture with long legs in a bay window to maintain the open look of the alcove. Relate the upholstery fabric on the chairs to the upholstered pieces in the adjacent room; i.e., choose fabrics that match or share a common color, texture or sheen.
A custom sofa that mimics the angles of a bay window is a furniture choice that works with any decorating style. A custom-made piece of furniture can be expensive, and it exemplifies quality and gives a room an instant upscale feel. Placing a coffee table in front of the couch and flanking the sofa with side chairs and side tables creates a symmetrical design that has wide appeal.