There is a huge difference between new and radically new. Musicians, artists, writers, architects, engineers, chemists... the list goes on, think of new stuff all the time. Just because music and its general schema is not new does not mean there aren't novel compositions. authors, take archetypes, formulas, and stereotypes to combine to make new stories all the time, just because they are stories that are familiar to us formulaic-ally does not mean they aren't new. Now, if people are talking about radically new, never heard of before things not based somehow on previous experience or time honored formulas, that happens very rarely if at all, and would be a very special thing.