Yep. Not just music companies too, patents are just as bad. That shit ought to expire after a decade tops, everyone would be better off.
As far as copyrighted content stuff... I think a year or two is enough. Especially for movies and music which, afaik, make most of their money right after release. This would disincentivize most of the blatant copyright abuse happening today, while still allowing the creators to earn their money.
The LPF (League for Programming Freedom) saw all of this corporate nonsense coming in 1990: portfolio warfare among giants; trolling and extorting; patenting trivial things and then trolling; and to your point, the death of the heroic lone inventor without a large team of patent lawyers to earn the money.
The LPF is gone now, software patents are the domain of large corporations, and garage guy is (largely?) no more.