Welcome to The Weekend Stream, The Second Disc’s review of notable catalogue titles (and some new ones, too!) making digital debuts!   This week, we’re heavy on the classic rock plus a vintage soundtrack, a dash of modern classical, and more!  Fleetwood Mac, Live from the Record Plant (December 15, 1974) (Rhino) (iTunes / Amazon) Coinciding with its standalone vinyl debut as part of Rhino’s Start Your Ear Off Right, this vintage pre-Buckingham/Nicks Fleetwood Mac concert hit digital services earlier this month.  (Better late than never!)  Featuring the classic early-era tracks “Hypnotized,” “Oh…