Back in 1953, the International Standards Organization sought to bring some sanity to music. To make sure everyone everywhere was in tune with each other, it was declared that middle A on a piano keyboard should be forever tuned to 440 Hz. The established ratios that led to all the other notes would be keyed off that 440 Hz tone.
This ensured that a piano in London sounded the same as a piano in Tokyo as a piano in Mumbai as a piano in Moose Jaw.
This standard has served us pretty well. But if you listen to certain scientists, the ISO got it wrong. Middle A should have been set at 432 Hz. Why? So that our music would be more harmonious with the rest of the universe.
This might sound like some tinfoil hat/new age bullshit, but it’s not. There are some pretty compelling arguments for 432 Hz–although it’s probably a little late to change things now.
Still, it’s interesting to make some audio comparisons. Check out this video. Which tuning sounds better to you?