I could write a similar article "lose perfect pitch in 15 years". My sense of pitch was cast-iron in college and in the years after. It started to get a bit me

I could write a similar article "lose perfect pitch in 15 years". My sense of pitch was cast-iron in college and in the years after. It started to get a bit messed up after singing a bunch of stuff at 415 Hz and (worse) 430 Hz instead of the usual 440. And then I went cold-turkey on music-making for over a decade. I think it was not playing violin regularly that really did it — tuning and playing an instrument really helps the memory aspect.