Raise the Roof by Robert Plant and Alison Krauss was the most-played album on folk radio during December 2021, while “The Turning Year: A New Year’s Toast” by Jennifer Cutting’s Ocean Orchestra was the month’s most-played song. Bill Staines, the New Hampshire-based traveling troubadour and prolific songwriter who died last month, was December’s top artist. So say charts compiled by Folk Alliance International based on radio playlists submitted to FOLKDJ-L, an electronic discussion group for DJs and others interested in folk-based music on the radio. [The monthly top albums, songs and artists charts are posted with permission. Click on the headline to view them.]