As the clock signals 11 a.m., and work-weary Dallasites bide time until their noon lunch break, a smattering of songs streams over their radios. Pink kicks off a four-song music block, followed by Lenny Kravitz, Tina Turner and Led Zeppelin. These days radio listeners usually have to surf different stations to hear those four sounds, as the range of genres doesn't fall within a typical station's playlist. But not at one Dallas station--a station that has topped the ratings charts for five of the nine months since it switched formats.
Music aficionados, don't touch that dial: 100.3 Jack FM is in random-shuffle...