I think it was only when I saw Johnny Marr play his own version of How Soon is Now that I realised a song (a band, even) that I'd never much cared for has in fact got a stunning intro. I'm sure if I thought long enough and hard enough I could come up with a few more examples of this genre. But as I've just alienated all my Smiths loving readers I think I'll quit while I'm behind - for fear of inadvertently slaughtering another sacred cow.
Johnny Marr - How Soon is Now