Co-Creaters deserve appropirate compensation (Score 1)

If an artist uses a piece of another artist's work, the former should share any profits with the latter and give credit. Just as if they were co-creaters, which in this case, they are. It's the same as if you write a song with another artist, and then put it out on your own without crediting or including your co-writer in any financial rewards. This would obviously be wrong.