But it should require active regular renewal, to create the record of continued ownership.
You should get a (reasonable) protected period of time automatically, to give you time to figure out which works are worth the effort to continue protecting. But it should require (minimal) active ongoing effort to maintain that protection.
For me, this is especially relevant when it comes to abandoned digital content (like video games and other applications). It'll be *so* much harder to archive and preserve content that's 140 years old, than it will be content that's 14-28 years old.
That being said, what in reality would happen if you release that sheet music? If it's abandoned, there wouldn't be anyone to come after you for it. You could just put it up online for free and then honor DMCA takedowns from people who can prove they are the rights holder.
I really like the model of every work automatically receiving protection. I think creations should automatically receive a relatively short-term automatic copy-right protection (say 14 years). After that, I think extensions should require manual renewals by the current rights holder (including contact information for the rights holder)