A star-studded cast will honor 55 remarkable years of public television - America's trusted, free public media service that reaches every city, town, and rural community across the nation. Featuring music director Rickey Minor and appearances by Josh Groban, Jamie Lee Curtis, Ziggy Marley, Lily Tomlin, Noel Paul Stookey, Rick Steves, David Foster and Katherine MacPhee, Joe Bonamassa, Lucy Dacus,Celtic Woman, Lindsay Ell, Sarah Silverman, Martha Plimpton and so many more