Re: music
The irony here in Washington is we are not allowed to wear headphones but motorcyclists are allowed have speakers inside their helmets - go figure.
For the last 20 years or so I have used over the ear headphones in the Healey, now with and Ipod but started with a Walkman. I never knew or even thought to ask if it was allowed until about 5 years ago someone pointed out the law.
In all that time, travelling in Washington, Idaho, Montana, Oregon, California, British Columbia and Alberta as well as a trip across the country to Wisconsin I have never been stopped by a cop and most of my driving is with the top down so I am very visible.
I have concluded that no one really cares, I hope. I haven't checked recently but it used to be that deaf people could drive, so why should headphones be a problem...
Dave