. . . . . . . "Filmed by GREAT PERFORMANCES, ???Pete Seeger???s 90th Birthday Celebration From Madison Square Garden??? encores Monday, March 14 at 10 p.m. on WXXI-TV (DT21.1/cable1011/cable11).Joining Seeger for this once-in-a-lifetime concert event were more than 40 artists, including Bruce Springsteen, John Mellencamp, Arlo Guthrie, Joan Baez, Kris Kristofferson, Richie Havens, Roger McGuinn, Ani DiFranco, Ta" . . . .