Pretty sure the biggest victims of this were Rockapella (who apparently did every a cappella song) and Weird Al (who apparently recorded every comedy song).

Here’s how cool Al Yankovic is though: for years he maintained a list on his website of every comedy song falsely attributed to him and all the actual artists who made them. I don’t think it’s up anymore, there can’t be much need for it these days, but Al was very cool for doing that.