Copyright should ideally expire with the death of the artist;
or at longest, the death of spouse and children,
or the artist's parents and siblings.
Whichever outlives the others...

Too much accessibility to recorded music is controlled by petty greedy philistine relatives, or corporations,
set up as rights owners of the estates of deceased artists..

While recordings get lost, perish, or are spitefully destroyed..

I don't know if artists can legally exclude relatives & businesses they never liked
from inheriting their estate,
but if I'd been a successful artist, I would if I could...