The lack of which allows one to dismiss art or music out of hand regardless of any other qualities it might possess. Primary indicator that a work is not authentic is that the performer did not do all writing, composition, arranging, and production of the song themselves, which instead was done by a team of skilled professionals. Post-modern irony however, can bring authenticity to what was otherwise inauthentic. Hence Britney Spears song "Womanizer" which is not authentic, becomes authentic when Lilly Allen does a cover of it.