Welcome to another edition of The Weekend Stream, The Second Disc’s review of notable catalogue titles (and some new ones, too!) making digital debuts. It’s a positively packed line-up today: pop icons old and new, unique stage experiences and two different trips to the land of Oz – plus a really cool recording summit opportunity for New Yorkers and a trio of tributes to some deceased musical heroes. Madonna, Confessions on a Dance Floor (Twenty Years Edition) (Warner/Rhino) (Apple / Amazon) The Queen of Pop’s next studio album, reportedly due out next year, is…