Mark Swed has been taking in “The MTT Files,” Michael Tilson Thomas’s new radio program that promises to bring the general public back into the classical music fold. “The series is personal. It recognizes that music demands paying attention, not multi-tasking. It takes great leaps of imagination, which can be accomplished much more effectively on radio than on television. And given that MTT is an inspired mimic, his voice brings to life the likes of Stravinsky and Heifetz. He can also be very funny.”