Grand Piano

Released in 2020, the LEGO Ideas Grand Piano is an unusual combination of sculpture, mechanical model, musical tribute, and fan-created design. With 3,662 pieces, it was the largest LEGO Ideas set ever released by element count at the time—and the first Ideas set to incorporate LEGO Powered Up electronics.

The story began not inside LEGO, but with musician and LEGO fan Donny Chen. A piano teacher, tuner, and composer, Chen wanted to combine the two major creative interests in his life: music and LEGO building. His original Grand Piano concept was submitted to LEGO Ideas in 2018, gained the community support necessary to enter LEGO review, and was ultimately selected for production. Chen also became LEGO Ideas’ first Chinese Fan Designer.

That musical background is visible throughout the finished model. Rather than simply creating the outer shape of a grand piano, the designers attempted to reproduce what happens beneath the lid. Its removable 25-key keyboard operates individual hammer mechanisms, accompanied by moving dampers and a working pedal. Open the top and the interior reveals rows of strings, hammers, and mechanisms arranged to evoke the complex action hidden inside a real acoustic piano.

The exterior receives the same attention. The fallboard over the keyboard opens and closes; the music stand can be raised; the grand lid can be propped open; the legs rest on tiny caster wheels; and even the matching piano bench can be adjusted in height. The result is convincing enough that, without an object nearby for scale, photographs can momentarily make the model look like a real instrument.

Its most unusual feature is motion. A motor and LEGO Powered Up hub allow the piano to perform automatically while a connected phone or tablet supplies the music. During playback, the keys move as though an invisible pianist were sitting at the bench, turning what could have been a static display model into a miniature player piano.

LEGO marketed the model as a “playable” piano, although the term requires an interesting qualification. It is not a functioning 25-note electronic keyboard in which every physical key produces its corresponding musical pitch. In its interactive mode, the electronics detect a key press and the app advances through a prepared piece of music. The sound itself comes from the connected device. The illusion, however, is remarkably effective: physical keys, mechanical hammer action, synchronized movement, and recorded music combine to make the brick-built instrument appear to perform.

The production model also preserves a direct connection to its creator. LEGO included a printed music element bearing Donny Chen’s name and referencing a composition he used when presenting his original Grand Piano concept—a small signature hidden inside a set that began as one musician’s personal LEGO creation.

Grand Piano therefore represents something larger than an exceptionally detailed model of an instrument. It demonstrates what the LEGO Ideas program can do at its most ambitious: take a fan’s highly personal creation, preserve the idea that made it special, and then combine it with professional engineering to produce something LEGO had never made before. It does not merely depict the appearance of a piano; it attempts to capture the movement, mechanisms, and experience that make a piano an instrument.