Many years ago, I remember seeing a piano in a museum similar to the one shown above (built in 1787 by Christian Gottlob Hubert. On display at Germanisches Nationalmuseum - Nuremberg, Germany). I have often wondered why acoustic portable pianos never really took off. Although we've seen more portable keyboard instruments like harpsichords, accordions or electronic keyboards, they operate completely different from a traditional piano in that they either pluck the strings, use air with ...