Before Steve Parratt rolls up to your house in his trademark brown UPS truck, you might hear Led Zeppelin blaring through the sliding side door, or the animated chatter of sports radio.
Metal rock and sports talk are the soundtrack of the delivery route Mr. Parratt has been driving in Point Reyes Station and Inverness for nearly 13 years now—the capstone of a 29-year UPS career that began in April 1997 and will end…