Welcome to The Weekend Stream, a relaxing weekly review of notable digital-only catalogue titles.  There may be no CD or vinyl, but there’s plenty of great new/old music to usher you into the weekend. This week, it’s hardly Thanksgiving leftovers thanks to some British Christmas favorites, a legendary dance duo and a killer rockabilly discovery. Elton John, Step Into Christmas (Rocket/Mercury/UMe) (iTunes / Amazon) He may have retired from performing, but Elton John is still in the release game. He just reissued his joyous 1973 holiday single “Step Into Christmas,” digitally backed…