KT Tunstall with Paddy Casey

As we've gotten older, we've come to understand that there are certain things we have to come to grips with.

Death and the inevitable physical deterioration of our bodies, for example. Or, perhaps more alarmingly, the fact that the we will never, ever manage to get the funky acoustic rhythm stomp of "Black Horse and the Cherry Tree" by KT Tunstall out of our heads. What fresh torment is this? So the Scottish singer sold 4 million records and was nominated for two Grammys, so she must be doing something right. Touring behind her latest record, "Drastic Fantastic," Tunstall performs tonight.
— Luke O'Neil, Globe Correspondent