Errr i dont think we can say page started the metal era, because he simply didnt.. i dont think you can say it about people like hendrix or blackmore either
but anyway the first zeppelin song i've ever heard was black dog i didnt really like the whole album at the begining , and quite hated stairway for some time, because i usually hate long songs, but when i had the opportunity
to hear the whole song once, i knew i was into it and since then they are one of my 3-4 favorite bands