Without the specific source material, it would be speculative to provide a definitive answer to what Selena and Chris hear on the radio on their way back to Corpus Christi. If referencing the 1997 film 'Selena,' she does hear her own song on the radio, which is a moment of celebration.
In the context of Selena Quintanilla-Perez's life and the story that involves her and her husband Chris Perez, the question seems to pertain to a specific moment that may be depicted in a film or book about her life.
It's important to note that, without the specific source material (like a book, movie, or biography), it would be speculation to provide an exact answer to what Selena and Chris hear on the radio on their way back to Corpus Christi. However, if this moment comes from the 1997 biopic 'Selena,' there is no notable scene where they hear a specific news report about their relationship, a weather forecast, or a traffic report on the radio. In the film, there is a scene where Selena hears her own song on the radio for the first time - which is a significant milestone in her career. Depending on the adaptation or source material, details may vary.