Q: have you made music in a tuning that wasn't 12-tet?
A: i have tried, but it is pointless. if you put Cmaj in tune, Dmin is out of tune! the entire Cmaj-Dmin dialogue is not even possible unless you use equal tempered. without equal temperment, you can't even play in 1 key let alone change keys. it didn't occur to me how important it is