I wonder if we could add "record scratch noise" into the dead metaphors category, or if we'd need to make a new category for audio relics instead of written ones.
I'd say that metaphor not quite dead yet. A few generations are younger than CDs, but vinyl still appears in a lot of pop culture (in no small part thanks to nostalgia). I'd wager most teens would know that the vinyl scratch sound is indeed from vinyl, even though most would never have touched a vinyl disc. Dead media, but the metaphor is still fresh enough...
