Electronic music for electric cars

Electric cars such as the new Toyota Prius are reasonably fast but completely silent and thus represent a considerable danger to pedestrians - and what more ignominious fate is there than to be crushed under the wheels of a Toyota Prius because you didn't hear it coming?

Drivers of these vehicles could use their horn but this could be seen as aggressive. It would be far better for the car to broadcast music - like ice-cream vans, except that logic dictates electric cars should broadcast electronic music.

The only downside of this idea is that is might create Pavlovian responses in people to leap out of the way when they hear, say, Depeche Mode or Gary Numan.