Dec. 22-23 Mannheim Steamroller Orpheum Theater, 409 S. 16th St. 7:30 p.m., $37-$77, 345.0606 ticketomaha.com Tickets have been on sale since Aug. 19, but at last word a few still remained for both performances. This is the real local act made good, Grammy winner Chip Davis’s Mannheim Steamroller. It was 26 years ago that Davis released Mannheim Steamroller Christmas, launching the group he created, with Renaissance instruments and rock beats. Hard to believe, but this is Mannheim’s 25th Christmas tour, making the group a genuine local holiday tradition. But they are loved worldwide. Mannheim Steamroller stands as the biggest selling Christmas music artist in history and one of the 50 biggest selling musical acts of all time, with more than 35 million albums sold. Even Scrooge would tell you to make this show.