There are several ways to tell if it’s Christmastime if you’ve been in a coma for several years and your body lost its natural sense of seasonal rhythm. It’s understandable. If you’re in Texas, it’s a little harder to tell compared to most parts of the state that are coated in a wintry landscape of ice and snow. For starters, if it’s going to snow, everyone in the state acts like the Book of Revelations are coming to fruition. The malls get flooded with angry people who are willing to shank a stranger over a discounted toaster. And let’s not forget about the Christmas music. You can hear it on the radio, every public loudspeaker and from the lips of that annoying troll who lives in your brain and won’t stop singing that “Barbie Girl” song every now and again. If you’ve managed to avoid attracting too many Christmas tune earworms, then you might be interested in checking out a live performance by the classic festive sounds of the Trans-Siberian Orchestra at one of two shows at 3:30 and 8 p.m. Thursday, Dec. 22, at the American Airlines Center, 2500 Victory Ave. The Trans-Siberian Orchestra are currently touring their annual winter “Ghosts of Christmas Eve” show, a live revival of the 1999 made-for-TV movie that used their iconic renditions of holiday classic to weave a story of hope and humanity just in time for the holidays. Tickets are $48.50 to $77.50 at ticketmaster.com.