Preview This Week's Glee — Rachel and Sam Take On Vanessa Carlton

Great news, Gleeks: we've got a peek at one of this week's Glee covers, "A Thousand Miles." Rachel and Sam take on the 2001 Vanessa Carlton hit as a duet, and though the original is hard to beat, they do a fantastic job. Glee's final season is going strong with the return to McKinley High and Lea Michele totally slaying tracks. Listen to the track below, and stay tuned for a video of the performance!