Hudson Harding Sampler, Vol. 10: Happy Holidays was the most-played album on folk radio during December 2015, while “Longest Night of the Year” by Joe Jencks, from that CD distributed by radio promoter Erik Balkey, tied with John McCutcheon’s classic “Christmas in the Trenches” as the month’s most-played song. So say charts compiled by Richard Gillmann from radio playlists submitted to FOLKDJ-L, an electronic discussion group for DJs and others interested in all folk-based music on the radio. The December 2015 FOLKDJ-L Top Albums and Songs charts are posted on AcousticMusicScene.com with permission. To view them, click on the headline.