Tonight at the Harris Theater, in the latest concert in the terrific MusicNow series, members of the Chicago Symphony Orchestra will give the U.S. premiere of Labyrinth (2011) by the masterful Russian composer Sofia Gubaidulina. I haven’t been able to learn much about the work, written for 12 cellos and commissioned by the Lucerne Festival—as part of a celebration of the composer’s 80th birthday—but I expect it to be as gripping, dramatic, and severe as much of Gubaidulina’s prolific output.