This just cracked me up. At the back of Consumer Reports' ShopSmart magazine, they've got a feature called "Back In the Day." These are the Spectra Radio Sunglasses, which Consumer Reports tested in 1966. At the time, they cost $19.95. More, from their writeup:
A quick flick of the switch on the left temple turned on the music (a tuning knob was on the right), but reception faded whenever you turned your head. So you had to sit perfectly still if you wanted to enjoy the music.