I know this is an old thread, but I thought I’d take a stab at the hard one.
In a world, where a piano is a weapon, not a musical instrument, on what does Scott Joplin play, “The Maple Leaf Rag”?
[spoiler] First, we assume pianos as warfare weaponry would take two forms. 1) Replacing explosives as the ordinance dropped by carpet bombing aircraft or 2) As anti-personnel suppression accomplished by down-tuning the pianos and simultaneously pounding all the keys on multiple pianos creating a concussive pressure wave to deter enemies from advancing.
“The Maple Leaf Rag” was copyrighted 18 September 1899; well before the World Wars. We must therefore assume there were no aerial bombardments in any wars before its composition. That leaves the second assumption of warfare.
In the American Civil War, advancement of battle lines is stymied by the amazingly effective anti-personnel properties of the War Piano. Thus, the Civil War takes an appearance much closer to that of World War I in which the North and South devolve into heavily fortified trench warfare (since the concussive wave from the pianos would be relatively ineffective against soldiers in trenches).
Since trench warfare is an inherently long and grueling form of war, and assuming that most line charges would be immediately stopped by the war pianos (and thus discouraging many more attempts), soldiers have an inordinate amount of downtime in which to be bored and wanting a feel of home. Since the war pianos are off-limits except to defend from attacks (and are mis-tuned anyway), soldiers turn to their equipment for a replacement.
Muskets can still be fired across the lines, so the only equipment that is entirely irrelevant is the soldiers’ bayonets. They therefore discover a way to tune them and play their favorite songs from home.
Regardless of the war’s outcome, since the War Piano is inherently non-lethal, relatively more soldiers return from the battle, bringing the tuned bayonets back with them. Their popularity proliferates amongst the civilian population, leading Scott Joplin to compose The Maple Leaf Rag" on tuned bayonets.
[/spoiler]
How’d I do?