With everything still closed, this week we take in the Velvet Undergound from San Fransisco's storied  Matrix  club, recorded on the venue's in-house 4-track machine in late November, 1969. I had thought to run one of these shows earlier, but which one? The band had been touring its third, eponymous , album and was in the midst of a residency at the club. They were playing two sets a night, and  The Complete Matrix Tapes  captures their shows from November 26th and 27th. The question is, which set? I sat down with the four of them on a long, cross-country drive this week and, honestly, you can't go wrong. We have four versions each of "Heroin", "Some Kinda Love" and "We're Gonna Have a Real Good Time Together"; three apiece of "I'm Waiting for the Man" and "There She Goes Again"; and doubles of several others. Which is the best copy of each? With "Heroin", it's hard to tell...maybe the shortest on...