In his book, JUST AS LONG AS I'M RIDING UP FRONT, Ray McIver tells of belonging to the Kiwanis club in the 1950s in the small town of San Marcos, Texas. The Kiwanians were a lively group, says McIver, all except for Roger Shelton. Roger came to meetings late, sat by himself, and rarely said a word. The Kiwanians would usually have entertainment of some kind before they got down to club business. At one particular meeting, the entertainment consisted of a barbershop quartet composed of local college professors. They were a popular bunch in San Marcos, singing for weddings and community events. But they had earned the nickname of the "Funeral Quartet" for singing so often at the local funeral home. Whenever a grieving family couldn't decide on the music they wanted for a deceased's memorial …