Cynics (or my children) looking at last evening’s twin bill at the beautiful Strathmore Music Hall would be tempted to title the show, “We’re Not Dead Yet!”  In response, the current edition of the Seldom Scene (one original member) and the Nitty Gritty Dirt Band (with a whopping three of the five original members) could respond with the same motto:  We may be older than dirt, but we can still fill a concert hall! The Scene (photo at the top of the post) played first, with mandolinist extraordinaire Jimmy Goodreau sitting in on a half-day’s notice for the ailing Lou Reed.  This isn’t your father’s Seldom Scene…the vocals don’t match those of Starling and Duffey, and no one can play those Dobro licks like Mike Auldridge…but this is still a good bluegrass band.  Dudley Connell is an expressive lead singer, Ronnie Simpkins — who along with Goodreau was a long-time member of the Tony Rice Unit — can play bass with the best of them, and 70-year-old Ben Eldridge provides the link to the original …