Nirvana was shameless in that regard, but brilliant in repackaging others' ideas.
I love the melvins, for example. You can REALLY see nirvana's malfeasance with their work lol
Once called a customer an idiot with a live phone. Boss called me into the office for it and said while he agreed that the guys an idiot, probably best I didn't do that again. Lesson: make sure the phone is hung up.