They make Kraftwerk proud but it looks as if those tinny Greensleeves chimes may soon be replaced by Britney. "Why do ice-cream vans sound so tinny - and why do they all play the same tune? Well, actually most don't sound tinny anymore - and they don't all play the same tune. Listen carefully next time you hear Greensleeves drifting in through the window and you'll probably be hearing high quality digital sound. You might even catch another of the thousands of tunes that are routinely used. Today's mobilers (as they're called in the ice cream profession) have the latest in digital sound technology at their fingertips..."