In 18th-century Europe, the 'musical dice game' (Musikali... | funfact.wiki | funfact.wiki
In 18th-century Europe, the 'musical dice game' (Musikalisches Würfelspiel) was a fad: roll dice to chain written bars into procedurally generatedmusic. 'KV 516f', attributed to Mozart, can produce about 1.3×10^29 pieces.
Piano keys once had the opposite color layout. In the era of Mozart and Beethoven, wide keys were black and narrow keys white. This was likely because ivory for white keys cost more than ebony for black keys.