The Original iPod

Apparently, a 1930 inventor had the idea for a sound system you could take with you well before Sony, Phillips, Apple, etc.

Money Quote:

"...may be worn without any convenience to the wearer."

Indeed, just as long as you don't tilt your head more than 15 Degrees. I've seen people in head-gear looking more casual than this. As a bonus, the protruding horn assures that your particular fondness for Spike Jones is enjoyed by everyone.

-Via Modern Mechanics