"I'm gonna sit right down and write myself an email, and make believe it came from you," doesn't really have the same ring as the original.
Likewise "Lonely days are gone. I'm a-goin' home, cos my baby just a-sent me a text".
And if Pat Boone were to croon that his "heart aches with every wave that breaks over tweets in the sand", he'd presumably be lamenting the water damage to his cellphone rather than the obliteration of his deathless prose.
It's hard to imagine songwriters composing lyrics about letters these days. Handwritten words on paper folded and tucked into an envelope have become, like the steam engine, charmingly antique. That's progress for you.
New Zealand Post seems to have begun a long-term process of bowing to the inevitable: even as the standard letter rate is set to rise from July 1, the state-owned enterprise is seeking changes to its 14-year-old deed so it can cut deliveries from six days a week to three.