An annihilation of man

Sampling rights becoming prohibitively expensive to use by small artists

Musicians being forced to sign over sampling rights to their record company, making any benefits they would hypothetically gain moot.

The Digital Milennium Copyright Act leading to the vidmaker-stomping nightmare that is ContentID

The DMCA leading to making it harder than ever to preserve media due to the way it prohibits tinkering with any locks the megacorps put on it, meaning it's way easier for artists' hard work to end up vaulted and lost.

The way basic chord progressions and musical styles have become copyrightable thanks to various lawsuits by the Marvin Gaye estate

The fact that the artists of the past used to be able to remix; adapt and iterate on art made within 56 years of them, likely created in their lifetimes, and now artists can only do those things with art produced nearly a century ago by people long dead.

New and independent artists being crowded out of the market by megacorp-owned IPs that would be public domain (and thusly convey less of an overwhelming advantage-via-marquee-value to megacorps) if the US had its pre-1976 copyright laws.

Times That Copyright Expansion Has Actually Materially Helped Artists On An Institutional Level:

Princess Magnolia

Beelzebub's youngest daughter and ruler of the Sloth ring (it was overtaken during a Hell Civil War). Magnolia is the most popular of her sisters and beloved by demons of all backgrounds. Her addictive honey hair can make even the most miserable demon smile, though consuming too much can leave them in an irreversible zombified state. Unlike her sisters, Magnolia considers herself a "herbivore" refusing to eat fellow demons as she finds it barbaric.

She has no qualms with eating Digital or Plant based demons though...