Grammy-nominated soul singer-songwriter Anthony David is celebrating the 20th anniversary of his breakthrough album, “3 Chords and the Truth.” He shares reflections and discusses the evolution of his artistry. Plus, Dr. Scott Stewart joins us for the latest installment of “Music in Media,” and playwright Ryan Landry and director Paul Conroy detail “Murder on the Polar Express,” a drag holiday comic mystery on stage at Out Front Theatre through December 22.