One of the greatest artists of the last century is having a little revival. Louis Armstrong — the gravely voiced singer and maestro of the trumpet — has a new album topping the charts now, more than 50 years after his death. It's a holiday record called "Louis Wishes You A Cool Yule." Also, a new documentary called "Louis Armstrong's Black and Blues" depicts the artist as never before — using his own words, from his own archive of hundreds of hours of recording. Ricky Riccardi, the director of research collections for the Louis Armstrong House Museum in Queens, joins us.