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. There’s new music from Sarah McLachlan, Public Enemy and Liam Finn, plus a new video to a one-hit wonder, a Record Store Day single gone digital, and tributes to musicians we lost this week. Peter Gabriel, In the Big Room (Real World) (Apple / Amazon) The legendary pop/rock voice has loosed a recording from his vault for larger public consumption: highlights from an intimate 2003 performance at his Real World…