The big shake-up in late night TV marches on and, so far, everyone’s making good decisions. Jimmy Fallon and the Roots will be moving to the Tonight Show, and former SNL head writer and Weekend Update host Seth Meyers will take Fallon’s old spot. But the big question of what kind of band Meyers would bring to the table got answered today with this tweet, and things are looking good. SNL alum and Portlandia visionary Fred Armisen will be the band leader, and he’ll be joined by members of Les Savy Fav and Kimberly Thomas, a session drummer for Beyonce. The shoes are big, but this is the right band to fill them …