The "copyrighted" material you are referring to is not as blatant as you so quickly assumed. It is people who think what they are writing down what they are hearing correctly. It is usually pretty close, but they are not the original artists so they do not actually know if it is 100% exact. But you seem to think they are getting the sheet music from the artists and posting exact copies. That is usually never the case with tabs posted online. If you would look at some of the sites instead of assuming, you would see how many different versions of the same tab exist. I don't think the artist wrote that many versions that seem to differ from each other, sometimes vastly. But you do. It is akin to someone retelling a story, by your standards. So any book synopsis should never be printed except by the publisher because you are infringing on someone's copyright by trying to convey what happened in a book.