Audio has been around since, I suppose, the spoken language. The difference now is distribution and availability. Audiobooks, podcasts, smart phones, voice controlled home speaker systems, connected cars, and who knows what will come next.
It's more than talking to your smartphone.
I’m not going to pretend to be a lifelong audiophile who knows the ins and outs of dB, wavelength, pop filters, and certainly not...
I got introduced to audiobooks because of having a baby. -- Susie Bright