A definitive document of the disco era, the Salsoul Orchestra’s Christmas Jollies offers funked-up renditions of holiday favorites including “The Little Drummer Boy,” “Sleigh Ride” and “Silent Night.” Also included is a pair of medleys, the first celebrating Christmas and the second New Year’s Day; the latter comprises an eclectic mixture of songs including “Auld Lang Salsoul,” “I’m Looking Over a Four-Leaf Clover,” “Alabama Jubilee,” “Oh, Dem Golden Slippers” and “God Bless America.” – Jason Ankeny