Well I would expect them to have been around for longer if they were to be ancestors of mammals.

Taking your logic to its conclusion fishes (or descendants of fish) regularly recite Shakespeare.

However there is a major flaw in your logic. Fishes (or their descendants) reciting Shakespeare is part of natural history. AI making quality music videos is just a prediction (or maybe even just wishful thinking). The former has occurred and has been observed, the later has not. So you are comparing nature with science fiction.