In radio, one group of people have the task of saying station call letters dozens of times a day. They're known as signature voices. And it's a very select group of performers and producers who take on the task of marketing a radio station to its own audience. From how they sound to the attitude behind their performances, signature voices have long been part of radio's sonic landscape. We'll tip the cap to 2 of those signature voice performers from WHAM's past and introduce you to Vistor Lisle - the man behind WHAM's current signature sound.