Ten years after his death, Johnny Cash will be immortalized by the U.S. Postal Service. A limited-edition Forever stamp dedicated to the music legend will go on sale Wednesday. The stamp features a promotional picture of Cash taken around the 1963 release of "Ring of Fire: The Best of Johnny Cash." Cash's son, John Carter Cash, said the stamp "just truly embodies my father's spirit." To celebrate, the younger Cash and several friends will host a free public concert in Nashville this week starring Randy Travis, Marty Stuart, Larry Gatlin, and The Oak Ridge Boys.