Abstract
Paul Goguen once said that art is either plagiarism or revolution. That is certainly true of music. From pop to jazz to classical music, there’s a long history of borrowing, lifting, and stealing from other composers, along with other ways of building on their artistic contributions. Here I try to put some order in the complex picture that emerges from such a history, with an eye to the criteria—if any—that underlie the complex ways in which we compare, identify, and categorize musical works.