從風琴 、 古鋼琴 、 大鍵琴 ， 到鋼琴 琴鍵都一直演變緊 直到十九世紀中期 一班發明家突發奇想 摞鍵盤嚟寫信 ， 而唔係摞鍵盤演奏
From the organ, the piano, the harpsichord, to the piano keys also evolved until the mid-nineteenth century, when a group of inventors had the whim to wipe the keyboard to write letters instead of pickling the keyboard