Welcome back to another edition of The Weekend Stream, The Second Disc’s review of notable catalogue titles making digital debuts, plus new works from legacy acts and even some personally curated favorites. One of the busiest weeks this column has ever enjoyed includes new music from pop’s biggest figure, its reigning queen and one of the biggest rock bands in the world – plus a generous handful of even more rarities, remixes, re-recordings and rediscoveries. Taylor Swift, The Life of a Showgirl: The Encore (Republic) (Apple / Amazon) Like death and taxes, new…