How friendly experiments led Robert Plant and Alison Krauss to record 'Raise the Roof'

Summary: Legendary singers Robert Plant and Alison Krauss, two of music's greats, have teamed up again for a new album with plans to tour internationally -- for the first time in 12 years. Jeffrey Brown went to Nashville to talk about the magic behind the music-making as part of our arts and culture series, CANVAS. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders