Welcome to a special edition of The Weekend Stream, The Second Disc’s review of notable catalogue titles making digital debuts. With the most wonderful time of the year officially in full swing, it’s worth going back and highlighting some great holiday hits and Christmas curiosities made available to stream and download in the last month or so. Which ones are you excited to find under the tree? Elton John, Step Into Christmas (Mercury) (iTunes / Amazon) One of the best “recent” additions to the modern Christmas music canon, “Step Into Christmas” celebrates its 50th…