The most popular and enduring Christmas songs, from "Jingle Bells" to "All I Want for Christmas Is You," share many traits, according to musicologist Joe Bennett. He talks with David Pogue about the most common songwriting components that make a great Christmas classic. Then, Pogue tries his hand at composing a holiday song, "The Sound of Christmas," which is given its world premiere performance by Broadway star Kerry Butler. https://cbsn.ws/4rRQyA1 | CBS Sunday Morning