"Greatest Time of Year" is the only single from Aly & AJ's Christmas album Acoustic Hearts of Winter. The single was used for The Santa Clause 3, similar to the way Hilary Duff's song "Santa Clause Lane" was used for The Santa Clause 2, and the music video also had scenes from the film. The video first aired on October 16, 2006 on the Disney Channel. The single debuted at number 96 on the U.S. Billboard Hot 100 chart.