A few years ago, The Slip’s Andrew and Brad Barr recorded a short holiday album as a gift for their parents and later released the recording to fans. Now, the siblings are getting into the holiday spirit with their Barr Brothers project. The group has written the new original Christmas song “Dear Mrs. Claus,” which can be found above. The song was recorded in Montreal by Rob Heaney and Patrick Watson, the latter of whom also provides guest vocals. The Barrs will perform as part of The Slip at San Francisco’s Cafe Du Nord on December 30 and 31.