Santa Claus is Coming to Town, The Four Seasons(this is a sing your heart out in the car while smiling)
Feed The World, Bandaid (always brings tears to my eyes, still sing very loudly much to my families embarrassment)
Father Christmas, The Kinks (hysterical but pulls on the heart strings)
Walking in a Winter Wonderland, Johnny Mathis (a classic)
Those are my TOP seasonal songs. What are yours?